You are given a rectangular cake, represented as an r × c grid. Each cell either has an evil strawberry, or is empty. For example, a 3 × 4 cake may look as follows:

<image>

The cakeminator is going to eat the cake! Each time he eats, he chooses a row or a column that does not contain any evil strawberries and contains at least one cake cell that has not been eaten before, and eats all the cake cells there. He may decide to eat any number of times.

Please output the maximum number of cake cells that the cakeminator can eat.

Input

The first line contains two integers r and c (2 ≤ r, c ≤ 10), denoting the number of rows and the number of columns of the cake. The next r lines each contains c characters — the j-th character of the i-th line denotes the content of the cell at row i and column j, and is either one of these: 

  * '.' character denotes a cake cell with no evil strawberry; 
  * 'S' character denotes a cake cell with an evil strawberry. 

Output

Output the maximum number of cake cells that the cakeminator can eat.

Examples

Input

3 4
S...
....
..S.


Output

8

Note

For the first example, one possible way to eat the maximum number of cake cells is as follows (perform 3 eats).

<image> <image> <image>
import java.io.*;
import java.util.*;


public class Main {

    private static List<List<Integer>> subsets;

    public static void main(String[] args) throws IOException {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream);

        int r = in.nextInt();
        int c = in.nextInt();
        boolean[] rows = new boolean[r];
        boolean[] cols = new boolean[c];
        char[][] cc = new char[r][c];
        for (int i = 0; i < r; i++) {
            cc[i] = in.next().toCharArray();
        }
        for (int i = 0; i < r; i++) {
            for (int j = 0; j < c; j++) {
                if(cc[i][j] == 'S') {
                    rows[i] = true;
                    cols[j] = true;
                }
            }
        }

        int sum = 0;
        int num = 0;
        for (int i = 0; i < cols.length; i++) {
            if(!cols[i]) {
                sum+=r;
                num++;
            }
        }
        for (int i = 0; i < rows.length; i++) {
            if(!rows[i]) {
                sum+=c-num;
            }
        }
        out.println(sum);
        out.flush();
    }
    static char [] convert(char [] c) {
        for (int i = 0; i < c.length; i++) {
            char current = c[i];
            if (current == '9') {
                c[i] = '0';
            }
            else {
                c[i] = ++c[i];
            }
        }
        return c;
    }
    static char [] shift(char [] c) {
        char temp = c[c.length - 1];
        for (int i = 0; i < c.length;i++) {
            char current = c[i];
            c[i] = temp;
            temp = current;
        }
        c[0] = temp;
        return c;
    }
    static void subsets(int [] a, int index, List<Integer> list) {
        subsets.add(new ArrayList<>(list));
        for (int i = index; i < a.length; i++) {
            list.add(a[i]);
            subsets(a,i+1,list);
            list.remove(list.size() - 1);
        }
    }
    static long sum(long n) {
        return n*(n+1)/2;
    }
    static int gcd(int a,int b) {
        return b==0 ? a : gcd(b,a%b);
    }
    static int lcm(int a,int b,int gcd) {
        return a*b/gcd;
    }

}
class Point {
    int x;
    int y;
    public int getX() {
        return x;
    }
    public int getY() {
        return y;
    }
    public Point(int x,int y) {
        this.x = x;
        this.y = y;
    }
}
class InputReader extends BufferedReader {
    StringTokenizer tokenizer;

    public InputReader(InputStream inputStream) {
        super(new InputStreamReader(inputStream), 32768);
    }

    public InputReader(String filename) {
        super(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(filename)));
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            }
        }
        return tokenizer.nextToken();
    }
    public Integer nextInt() {return Integer.valueOf(next());}
    public Long nextLong() {return  Long.valueOf(next());}
    public Double nextDouble() {return Double.valueOf(next());}

    static class OutputWriter extends PrintWriter {
        public OutputWriter(OutputStream outputStream) {
            super(outputStream);
        }

        public OutputWriter(Writer writer) {
            super(writer);
        }

        public OutputWriter(String filename) throws FileNotFoundException {
            super(filename);
        }

        public void close() {
            super.close();
        }
    }
}