The legendary Farmer John is throwing a huge party, and animals from all over the world are hanging out at his house. His guests are hungry, so he instructs his cow Bessie to bring out the snacks! Moo!

There are n snacks flavors, numbered with integers 1, 2, …, n. Bessie has n snacks, one snack of each flavor. Every guest has exactly two favorite flavors. The procedure for eating snacks will go as follows:

  * First, Bessie will line up the guests in some way. 
  * Then in this order, guests will approach the snacks one by one. 
  * Each guest in their turn will eat all remaining snacks of their favorite flavor. In case no favorite flavors are present when a guest goes up, they become very sad. 



Help Bessie to minimize the number of sad guests by lining the guests in an optimal way.

Input

The first line contains integers n and k (2 ≤ n ≤ 10^5, 1 ≤ k ≤ 10^5), the number of snacks and the number of guests. 

The i-th of the following k lines contains two integers x_i and y_i (1 ≤ x_i, y_i ≤ n, x_i ≠ y_i), favorite snack flavors of the i-th guest.

Output

Output one integer, the smallest possible number of sad guests.

Examples

Input


5 4
1 2
4 3
1 4
3 4


Output


1


Input


6 5
2 3
2 1
3 4
6 5
4 5


Output


0

Note

In the first example, Bessie can order the guests like this: 3, 1, 2, 4. Guest 3 goes first and eats snacks 1 and 4. Then the guest 1 goes and eats the snack 2 only, because the snack 1 has already been eaten. Similarly, the guest 2 goes up and eats the snack 3 only. All the snacks are gone, so the guest 4 will be sad. 

In the second example, one optimal ordering is 2, 1, 3, 5, 4. All the guests will be satisfied.
import java.io.*;
import java.util.*;
import java.math.*;

public class CowAndSnacks {
    static Scanner sc = new Scanner(System.in);
    static PrintWriter pw = new PrintWriter(System.out), pw2 = new PrintWriter(System.out);
    static class UnionSet{
        int setCount,setSize[],p[];
        UnionSet(int n){
            setCount=n;
            setSize=new int[n+1];
            p=new int[n+1];
            for(int i=0;i<=n;i++){
                setSize[i]=1;
                p[i]=i;
            }
        }
        public int findSet(int i){
            return p[i]==i?i:(p[i]=findSet(p[i]));
        }
        public boolean isSameSet(int i,int j){
            return findSet(i)==findSet(j);
        }
        public void union(int i,int j){
            int root1=findSet(i),root2=findSet(j);
            if(root1==root2)
                return;
            if(setSize[root1]>setSize[root2]){
                p[root2]=root1;
                setSize[root1]+=setSize[root2];
            }else{
                p[root1]=root2;
                setSize[root2]+=setSize[root1];
            }
            setCount--;
        }
    }
    public static void main(String[] args) throws IOException {
       int n=sc.nextInt();
       UnionSet DSU=new UnionSet(n);
       int m=sc.nextInt();
       int c=0;
       for(int i=0;i<m;i++){
           int x=sc.nextInt(),y=sc.nextInt();
           if(DSU.isSameSet(x,y)) {
               c++;
           }
           DSU.union(x,y);
       }
       System.out.println(c);
    }

    public static <E> void print2D(E[][] arr) {
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr[i].length; j++) {
                pw.println(arr[i][j]);
            }
        }
    }

    public static int digitSum(String s) {
        int toReturn = 0;
        for (int i = 0; i < s.length(); i++) toReturn += Integer.parseInt(s.charAt(i) + " ");
        return toReturn;
    }

    public static boolean isPrime(long n) {
        if (n <= 1)
            return false;
        if (n <= 3)
            return true;

        if (n % 2 == 0 || n % 3 == 0)
            return false;

        for (long i = 5; i * i <= n; i = i + 6)
            if (n % i == 0 || n % (i + 2) == 0)
                return false;
        return true;
    }

    public static long pow(long a, long pow) {
        return pow == 0 ? 1 : pow % 2 == 0 ? pow(a * a, pow >> 1) : a * pow(a * a, pow >> 1);
    }

    public static long sumNum(long a) {
        return a * (a + 1) / 2;
    }

    public static int gcd(int n1, int n2) {
        return n2 == 0 ? n1 : gcd(n2, n1 % n2);
    }

    public static long factorial(long a) {
        return a == 0 || a == 1 ? 1 : a * factorial(a - 1);
    }

    public static void sort(int arr[]) {
        shuffle(arr);
        Arrays.sort(arr);
    }

    public static void shuffle(int arr[]) {
        Random rnd = new Random();
        for (int i = arr.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            int temp = arr[index];
            arr[index] = arr[i];
            arr[i] = temp;
        }
    }

    public static Double[] solveQuadratic(double a, double b, double c) {
        double result = (b * b) - 4.0 * a * c;
        double r1;
        if (result > 0.0) {
            r1 = ((double) (-b) + Math.pow(result, 0.5)) / (2.0 * a);
            double r2 = ((double) (-b) - Math.pow(result, 0.5)) / (2.0 * a);
            return new Double[]{r1, r2};
        } else if (result == 0.0) {
            r1 = (double) (-b) / (2.0 * a);
            return new Double[]{r1, r1};
        } else {
            return new Double[]{null, null};
        }
    }

    static class Scanner {
        StringTokenizer st;
        BufferedReader br;

        public Scanner(FileReader r) {
            br = new BufferedReader(r);
        }

        public Scanner(InputStream s) {
            br = new BufferedReader(new InputStreamReader(s));
        }

        public String next() throws IOException {
            while (st == null || !st.hasMoreTokens())
                st = new StringTokenizer(br.readLine());
            return st.nextToken();
        }

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

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

        public String nextLine() throws IOException {
            return br.readLine();
        }

        public double nextDouble() throws IOException {
            String x = next();
            StringBuilder sb = new StringBuilder("0");
            double res = 0, f = 1;
            boolean dec = false, neg = false;
            int start = 0;
            if (x.charAt(0) == '-') {
                neg = true;
                start++;
            }
            for (int i = start; i < x.length(); i++)
                if (x.charAt(i) == '.') {
                    res = Long.parseLong(sb.toString());
                    sb = new StringBuilder("0");
                    dec = true;
                } else {
                    sb.append(x.charAt(i));
                    if (dec)
                        f *= 10;
                }
            res += Long.parseLong(sb.toString()) / f;
            return res * (neg ? -1 : 1);
        }

        public boolean ready() throws IOException {
            return br.ready();
        }
    }

    static class pair<E1, E2> implements Comparable<pair> {
        E1 x;
        E2 y;

        pair(E1 x, E2 y) {
            this.x = x;
            this.y = y;
        }

        @Override
        public int compareTo(pair o) {
            return x.equals(o.x) ? (Integer) y - (Integer) o.y : (Integer) x - (Integer) o.x;
        }

        @Override
        public String toString() {
            return x + " " + y;
        }

        public double pointDis(pair p1) {
            return Math.sqrt(((Integer) y - (Integer) p1.y) * ((Integer) y - (Integer) p1.y) + ((Integer) x - (Integer) p1.x) * ((Integer) x - (Integer) p1.x));
        }
    }

}
