Suppose that you are in a campus and have to go for classes day by day. As you may see, when you hurry to a classroom, you surprisingly find that many seats there are already occupied. Today you and your friends went for class, and found out that some of the seats were occupied.

The classroom contains n rows of seats and there are m seats in each row. Then the classroom can be represented as an n × m matrix. The character '.' represents an empty seat, while '*' means that the seat is occupied. You need to find k consecutive empty seats in the same row or column and arrange those seats for you and your friends. Your task is to find the number of ways to arrange the seats. Two ways are considered different if sets of places that students occupy differs.

Input

The first line contains three positive integers n,m,k (1 ≤ n, m, k ≤ 2 000), where n,m represent the sizes of the classroom and k is the number of consecutive seats you need to find.

Each of the next n lines contains m characters '.' or '*'. They form a matrix representing the classroom, '.' denotes an empty seat, and '*' denotes an occupied seat.

Output

A single number, denoting the number of ways to find k empty seats in the same row or column.

Examples

Input

2 3 2
**.
...


Output

3


Input

1 2 2
..


Output

1


Input

3 3 4
.*.
*.*
.*.


Output

0

Note

In the first sample, there are three ways to arrange those seats. You can take the following seats for your arrangement. 

  * (1,3), (2,3) 
  * (2,2), (2,3) 
  * (2,1), (2,2) 
//package javaapplication1;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.lang.reflect.Array;
import static java.lang.reflect.Array.set;
import java.math.BigInteger;
import java.util.AbstractList;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Scanner;
import java.util.Set;
import java.util.Stack;
import java.util.StringTokenizer;
import static jdk.nashorn.internal.objects.Global.Infinity;
import static jdk.nashorn.internal.objects.NativeMath.round;
import sun.awt.HKSCS;

/*
   PARTIAL AUTHOR GEORGE
   MAINLY GEEKSFORGEEKS ALL RIGHTS RESERVED.
*/
public class Main {
        public static class point{
        int x;int y;

        public point(int x, int y) {
            this.x = x;
            this.y = y;
        }
        
        }
        public static void main(String[] args) throws IOException{
        BufferedReader BR=new BufferedReader(new InputStreamReader(System.in));
        PrintWriter PW=new PrintWriter(new PrintStream(System.out));
        In IN=new In(BR);
        Out OUT=new Out(PW);
        Scanner SC=new Scanner(System.in);
        //DataStructure DS=new DataStructure();
        Functions F=new Functions();
        //QuickSort QS=new QuickSort();
        //BinarySearch BS=new BinarySearch();
        //FIB fubbonanci=new FIB(93);
        //Map<Character,List<Integer>>Pos=new HashMap<>();
        //Set<Integer>ans=new HashSet<>();
        int n,m,r;
        String  [] in=BR.readLine().split(" ");
        n=Integer.parseInt(in[0]);
        m=Integer.parseInt(in[1]);
        r=Integer.parseInt(in[2]);
        char [][]board=new char[n][m];
            for (int i = 0; i < n; i++) {
                board[i]=BR.readLine().toCharArray();
            }
        //scan rows
        if(m==1&&n==1){
        if(r==1&&board[0][0]=='.'){System.out.println(1);System.exit(0);}
        else{System.out.println(0);System.exit(0);}
        }
        long ans=0;
        int nn=0;
            //if(n>1&&m>1){
            List<point>x=new ArrayList<>();
            if(r==1){
            for (int i = 0; i < n; i++) {
                nn=0;
                for (int j = 0; j < m; j++) {
                    if(board[i][j]=='.'){++nn;}
                    else{
                      if(nn>=r){
                       ans+=((nn-r)+1);nn=0;
                      }
                        
                      else{nn=0;}
                        
                    }
                    if(j==m-1&&nn!=0){
                    if(nn>=r){ans+=((nn-r)+1);nn=0;}
                    else{nn=0;}
                    }
                }
            }
                System.out.println(ans);System.exit(0);
            }
            
            for (int i = 0; i < n; i++) {
                nn=0;
                for (int j = 0; j < m; j++) {
                    if(board[i][j]=='.'){++nn;}
                    else{
                      if(nn>=r){
                       ans+=((nn-r)+1);nn=0;
                      }
                        
                      else{nn=0;}
                        
                    }
                    if(j==m-1&&nn!=0){
                    if(nn>=r){ans+=((nn-r)+1);nn=0;}
                    else{nn=0;}
                    }
                }
            }
                //System.out.println(ans);
            
            //scan col
            for (int i = 0; i < m; i++) {
                nn=0;
                for (int j = 0; j < n; j++) {
                    if(board[j][i]=='.'){++nn;}
                    else{
                      if(nn>=r){ans+=((nn-r)+1);nn=0;}
                      else{nn=0;}
                    }
                    if(j==n-1&&nn!=0){
                     if(nn>=r){ans+=((nn-r)+1);nn=0;}
                     else{nn=0;}
                    }
                }
              }
           
           /* else if(n==1&&m>1){
            for (int i = 0; i < n; i++) {
                nn=0;
                for (int j = 0; j < m; j++) {
                    if(board[i][j]=='.')++nn;
                    else{
                      if(nn>=r){
                       ans+=((nn-r)+1);nn=0;
                      }
                        
                      else{nn=0;}
                        
                    }
                    if(j==m-1&&nn!=0){
                    if(nn>=r){ans+=((nn-r)+1);nn=0;}
                    else{nn=0;}
                    }
                }
            }
           }
            else if(n>1&&m==1){
             for (int i = 0; i < m; i++) {
                nn=0;
                for (int j = 0; j < n; j++) {
                    if(board[j][i]=='.')++nn;
                    else{
                      if(nn>=r){ans+=((nn-r)+1);nn=0;}
                      else{nn=0;}
                    }
                    if(j==n-1&&nn!=0){
                     if(nn>=r){ans+=((nn-r)+1);nn=0;}
                     else{nn=0;}
                    }
                }
            }
          }*/
            System.out.println(ans);
   }

    protected static class In {
        private BufferedReader reader;
        private StringTokenizer tokenizer = new StringTokenizer("");
        public In(BufferedReader reader) {
            this.reader = reader;
        }
        
        public String next() throws IOException {
            while (!tokenizer.hasMoreTokens())
                tokenizer = new StringTokenizer(reader.readLine());
            return tokenizer.nextToken();
        }

        public int nextInt() throws IOException {
            return Integer.parseInt(next());
        }

        public long nextLong() throws IOException {
            return Long.parseLong(next());
        }

        public double nextDouble() throws IOException {
            return Double.parseDouble(next());
        }

        public int[] nextIntArray(int n) throws IOException {
            int[] a = new int[n];
            for (int i = 0; i < n; i++)
                a[i] = nextInt();
            return a;
        }

        public int[] nextIntArray1(int n) throws IOException {
            int[] a = new int[n + 1];
            for (int i = 1; i <= n; i++)
                a[i] = nextInt();
            return a;
        }

        public int[] nextIntArraySorted(int n) throws IOException {
            int[] a = nextIntArray(n);
            Random r = new Random();
            for (int i = 0; i < n; i++) {
                int j = i + r.nextInt(n - i);
                int t = a[i];
                a[i] = a[j];
                a[j] = t;
            }
            Arrays.sort(a);
            return a;
        }

        public long[] nextLongArray(int n) throws IOException {
            long[] a = new long[n];
            for (int i = 0; i < n; i++)
                a[i] = nextLong();
            return a;
        }

        public long[] nextLongArray1(int n) throws IOException {
            long[] a = new long[n + 1];
            for (int i = 1; i <= n; i++)
                a[i] = nextLong();
            return a;
        }

        public long[] nextLongArraySorted(int n) throws IOException {
            long[] a = nextLongArray(n);
            Random r = new Random();
            for (int i = 0; i < n; i++) {
                int j = i + r.nextInt(n - i);
                long t = a[i];
                a[i] = a[j];
                a[j] = t;
            }
            Arrays.sort(a);
            return a;
        }
    }
    protected static class Out {
        private PrintWriter writer;
        private static boolean local = System
                .getProperty("ONLINE_JUDGE") == null;

        public Out(PrintWriter writer) {
            this.writer = writer;
        }

        public void print(char c) {
            writer.print(c);
        }

        public void print(int a) {
            writer.print(a);
        }

        public void println(Object a) {
            writer.println(a);
        }

        public void println(Object[] os) {
            for (int i = 0; i < os.length; i++) {
                writer.print(os[i]);
                writer.print(' ');
            }
            writer.println();
        }

        public void println(int[] a) {
            for (int i = 0; i < a.length; i++) {
                writer.print(a[i]);
                writer.print(' ');
            }
            writer.println();
        }

        public void println(long[] a) {
            for (int i = 0; i < a.length; i++) {
                writer.print(a[i]);
                writer.print(' ');
            }
            writer.println();
        }

        public static void db(Object... objects) {
            if (local)
                System.out.println(Arrays.deepToString(objects));
        }
    }
    public static class QuickSort{ 
    protected static int [] intArray;
    protected static long [] longArray;
    protected static double [] DoubleArray;
    protected static char [] charArray;
    protected static int Size;
        public QuickSort() {
        }
     
    protected static int partition(int arr[],int low,int high)
    {
      int pivot=arr[high];
      int i=low-1;
      int temp=0;
        for (int j = low; j < high; ++j) {
            if(arr[j]<=pivot)
            {
                 ++i;
                 temp = arr[i];
                 arr[i] = arr[j];
                 arr[j] = temp;
            }
        }
         temp = arr[i+1];
         arr[i+1] = arr[high];
         arr[high] = temp;
         return i+1;
    
    }
    protected static int partition(long arr[],int low,int high)
    {
      long pivot=arr[high];
      int i=low-1;
      long temp=0;
        for (int j = low; j < high; ++j) {
            if(arr[j]<=pivot)
            {
                 ++i;
                 temp = arr[i];
                 arr[i] = arr[j];
                 arr[j] = temp;
            }
        }
         temp = arr[i+1];
         arr[i+1] = arr[high];
         arr[high] = temp;
         return i+1;
    
    }
    protected static int partition(double arr[],int low,int high)
    {
      double pivot=arr[high];
      int i=low-1;
      double temp=0;
        for (int j = low; j < high; ++j) {
            if(arr[j]<=pivot)
            {
                 ++i;
                 temp = arr[i];
                 arr[i] = arr[j];
                 arr[j] = temp;
            }
        }
         temp = arr[i+1];
         arr[i+1] = arr[high];
         arr[high] = temp;
         return i+1;
    
    }
    protected static int partition(char arr[],int low,int high)
    {
      char pivot=arr[high];
      int i=low-1;
      char temp=0;
        for (int j = low; j < high; ++j) {
            if(arr[j]<=pivot)
            {
                 ++i;
                 temp = arr[i];
                 arr[i] = arr[j];
                 arr[j] = temp;
            }
        }
         temp = arr[i+1];
         arr[i+1] = arr[high];
         arr[high] = temp;
         return i+1;
    
    }
    protected static void sort(int arr[],int low, int high)
    {
          if(low < high)
          {
              int pi=partition(arr, low, high);
              sort(arr, low, pi-1);
              sort(arr, pi+1, high);
          
          }
         
    }
   protected static void sort(long arr[],int low, int high)
    {
          if(low < high)
          {
              int pi=partition(arr, low, high);
              sort(arr, low, pi-1);
              sort(arr, pi+1, high);
          
          }
    }

    protected static void sort(double arr[],int low, int high)
    {
          if(low < high)
          {
              int pi=partition(arr, low, high);
              sort(arr, low, pi-1);
              sort(arr, pi+1, high);
          
          }
    }
    protected static void sort(char arr[],int low, int high)
    {
          if(low < high)
          {
              int pi=partition(arr, low, high);
              sort(arr, low, pi-1);
              sort(arr, pi+1, high);
          
          }
    }
    protected  static void printArray(int arr[])
    {
        int n = arr.length;
        for (int i=0; i<n; ++i)
            System.out.print(arr[i]+" ");
        System.out.println();
    }
    protected  static void printArray(char arr[])
    {
        int n = arr.length;
        for (int i=0; i<n; ++i)
            System.out.print(arr[i]+" ");
        System.out.println();
    }
    protected  static void printArray(double arr[])
    {
        int n = arr.length;
        for (int i=0; i<n; ++i)
            System.out.print(arr[i]+" ");
        System.out.println();
    }
     protected  static void printArray(long arr[])
    {
        int n = arr.length;
        for (int i=0; i<n; ++i)
            System.out.print(arr[i]+" ");
        System.out.println();
    }
  }
    public static class Functions{

        public Functions() {
        }
        protected static boolean [] sieveOfEratosthenesPrimes(int limit){
        boolean prime[] = new boolean[limit+1];
        for(int i=0;i<limit;i++)
            prime[i] = true;
        for(int p = 2; p*p <=limit; p++)
        {
            // If prime[p] is not changed, then it is a prime
            if(prime[p] == true)
            {
                // Update all multiples of p
                for(int i = p*2; i <= limit; i += p)
                    prime[i] = false;
            }
        }
         return prime;
    }
    protected static boolean checkAnagram(String str1, String str2) {
        int i=0;
        for (char c : str1.toCharArray()) {
        i = str2.indexOf(c, i) + 1;
        if (i <= 0) { return false; }
    }
    return true;
    }
    protected static boolean contains(final int[] arr, final int key) {
    return Arrays.stream(arr).anyMatch(i -> i == key);
    }
    public static boolean contains(final long[] arr, final long key) {
    return Arrays.stream(arr).anyMatch(i -> i == key);
    }
    public static boolean contains(final double[] arr, final double key) {
    return Arrays.stream(arr).anyMatch(i -> i == key);
    }
    protected static long NCR(long N, long R){
    if(N < R)
        return 0;
    if(R == 0 || R == N)
        return 1;
    return NCR(N-1,R-1)+NCR(N-1,R);
    }
    protected static long NCR(int N, int R){
    if(N < R)
        return 0;
    if(R == 0 || R == N)
        return 1;
    return NCR(N-1,R-1)+NCR(N-1,R);
    }
    protected static String changeCharInPosition(int position, char ch, String str){
    char[] charArray = str.toCharArray();
    charArray[position] = ch;
    return new String(charArray);
    }
    protected static boolean isPrime(long n) {
    if(n < 2) return false;
    if(n == 2 || n == 3) return true;
    if(n%2 == 0 || n%3 == 0) return false;
    long sqrtN = (long)Math.sqrt(n)+1;
    for(long i = 6L; i <= sqrtN; i += 6) {
        if(n%(i-1) == 0 || n%(i+1) == 0) return false;
    }
    return true;
    }
    protected static long Gcd(long p, long q) {
        if (q == 0) return p;
        else return Gcd(q, p % q);
     }
    protected static boolean isPrime(int n) {
    if(n < 2) return false;
    if(n == 2 || n == 3) return true;
    if(n%2 == 0 || n%3 == 0) return false;
    int sqrtN = (int)Math.sqrt(n)+1;
    for(long i = 6L; i <= sqrtN; i += 6) {
        if(n%(i-1) == 0 || n%(i+1) == 0) return false;
    }
    return true;
    }
 }
  public static class BinarySearch{
        private static int middle;
        private static int L;
        private static int R;
        public BinarySearch() {
            
        }
        protected static int Search(int [] arr,int element){
         R=arr.length-1;
         L=0;
         return BS(arr, L, R, element);
        }
        protected static int Search(long [] arr,long element){
         R=arr.length-1;
         L=0;
         return BS(arr, L, R, element);
        }
        protected static int Search(char [] arr,char element){
         R=arr.length-1;
         L=0;
         return BS(arr, L, R, element);
        }
        protected static int Search(double [] arr,double element){
         R=arr.length-1;
         L=0;
         return BS(arr, L, R, element);
        }
         protected static int BS(int [] arr,int L,int R,int element){   
          if(R>=L)                  
          {
            middle=L+(R-L)/2;  
            if(arr[middle]==element)
            { 
                return middle;
            }    
            else if(arr[middle]>element)
            {
                return BS(arr, L,middle-1, element);
            }    
            else 
            {    
                return BS(arr, middle+1, R, element);
            }    
          } 
          else
            {
              return -1;
            }
          }
         protected static int BS(long [] arr,int L,int R,long element){   
          if(R>=L)                  
          {
            middle=L+(R-L)/2;  
            if(arr[middle]==element)
            { 
                return middle;
            }    
            else if(arr[middle]>element)
            {
                return BS(arr, L,middle-1, element);
            }    
            else 
            {    
                return BS(arr, middle+1, R, element);
            }    
          } 
          else
            {
              return -1;
            }
          }
         protected static int BS(char [] arr,int L,int R,char element){   
          if(R>=L)                  
          {
            middle=L+(R-L)/2;  
            if(arr[middle]==element)
            { 
                return middle;
            }    
            else if(arr[middle]>element)
            {
                return BS(arr, L,middle-1, element);
            }    
            else 
            {    
                return BS(arr, middle+1, R, element);
            }    
          } 
          else
            {
              return -1;
            }
          }
         protected static int BS(double [] arr,int L,int R,double element){   
          if(R>=L)                  
          {
            middle=L+(R-L)/2;  
            if(arr[middle]==element)
            { 
                return middle;
            }    
            else if(arr[middle]>element)
            {
                return BS(arr, L,middle-1, element);
            }    
            else 
            {    
                return BS(arr, middle+1, R, element);
            }    
          } 
          else
            {
              return -1;
            }
          }
    } 
    public static class DataStructure{

        public DataStructure() {
        }
    
    
     static void stack_push(Stack<Integer> stack)
    {
        for(int i = 0; i < 5; i++)
        {
            stack.push(i);
        }
    }
     
     
    // Popping element from the top of the stack
    static void stack_pop(Stack<Integer> stack)
    {
        System.out.println("Pop :");
 
        for(int i = 0; i < 5; i++)
        {
            Integer y = (Integer) stack.pop();
            System.out.println(y);
        }
    }
 
    // Displaying element on the top of the stack
    static void stack_peek(Stack<Integer> stack)
    {
        Integer element = (Integer) stack.peek();
        System.out.println("Element on stack top : " + element);
    }
     
    // Searching element in the stack
    static void stack_search(Stack<Integer> stack, int element)
    {
        Integer pos = (Integer) stack.search(element);
 
        if(pos == -1)
            System.out.println("Element not found");
        else
            System.out.println("Element is found at position " + pos);
    }
    
    }
   public static class FIB {
     
    protected static int MAX = 1000;
    protected static long f[];
    protected static int size=0;
    // Returns n'th fibonacci number using 
    // table f[]
    
    public FIB(int n)
    {
        f=new long[MAX];
        this.size=n;
        fib();
    }

        protected static void fib() {
            f[0]=0;f[1]=1;
            for (int i = 2; i < size; i++) {
                //if(f[i-1]+f[i-2]>Long.MAX_VALUE){f[i]=0;continue;}
                f[i]=f[i-1]+f[i-2];
            }
        }
        protected static void printSeries(){
            for (int i = 0; i <size; i++) {
                System.out.print(f[i]+" ");
            }
        
        }
    }
    public static class Graph{
 
    
    }
}
/*
Some References for doing things 
-Removing all Leading zeros in a string 
s.replaceFirst("^0+(?!$)", "");
-Creating comprator
public static class CustomComparator implements Comparator<c> {
    @Override
    public int compare(c o1, c o2) {
        return o1.score.compareTo(o2.score);
    }
}
-how to write switch case
   switch(x)
   {
    case 1:
    return l;
    ...
    default:
    return m;
   }
-Convert numbers of - to different bases
  Integer.toString(Integer.parseInt(number, base1), base2);
-Split over white spaces:
  myString.split("\\s+");
-how to know if 4 points will form a square or a rectangle:
    public static class point{
            int a,b;
            public point(int a, int b) {
                this.a = a;
                this.b = b;
                }

            @Override
            public String toString() {
                return "point{" + "a=" + a + ", b=" + b + '}';
                }
            }
            public static int distSq(point p, point q)
            {
            return (p.a - q.a)*(p.a - q.a) +
                    (p.b - q.b)*(p.b - q.b);
             }
         public static boolean isSquare(point p1, point p2, point p3, point p4)
    {
        int d2 = distSq(p1, p2);  // from p1 to p2
        int d3 = distSq(p1, p3);  // from p1 to p3
        int d4 = distSq(p1, p4);  // from p1 to p4

        // If lengths if (p1, p2) and (p1, p3) are same, then
        // following conditions must met to form a square.
        // 1) Square of length of (p1, p4) is same as twice
        //    the square of (p1, p2)
        // 2) p4 is at same distance from p2 and p3
        if (d2 == d3 && 2*d2 == d4)
        {
            int d = distSq(p2, p4);
            return (d == distSq(p3, p4) && d == d2);
        }

        // The below two cases are similar to above case
        if (d3 == d4 && 2*d3 == d2)
        {
            int d = distSq(p2, p3);
            return (d == distSq(p2, p4) && d == d3);
        }
        if (d2 == d4 && 2*d2 == d3)
        {
            int d = distSq(p2, p3);
            return (d == distSq(p3, p4) && d == d2);
        }

        return false;
    }
      public static boolean isRectangle(point p1,point p2,point p3,point p4)
    {
      double cx,cy;
      double dd1,dd2,dd3,dd4;
      double x1,y1,x2,y2,x3,y3,x4,y4;
      x1=p1.a;y1=p1.b;x2=p2.a;y2=p2.b;x3=p3.a;y3=p3.b;x4=p4.a;y4=p4.b;
      cx=(x1+x2+x3+x4)/4;
      cy=(y1+y2+y3+y4)/4;

      dd1=(cx-x1)*(cx-x1)+(cy-y1)*(cy-y1);
      dd2=(cx-x2)*(cx-x2)+(cy-y2)*(cy-y2);
      dd3=(cx-x3)*(cx-x3)+(cy-y3)*(cy-y3);
      dd4=(cx-x4)*(cx-x4)+(cy-y4)*(cy-y4);
      return dd1==dd2 && dd1==dd3 && dd1==dd4;
    }
*/
