题解 | #bit位数#

import java.util.*;
public class Main {
    public static int countDif(int m, int n) {
        int cnt = 0;
        while(m != 0 || n != 0) {
            if((m & 1) != (n & 1)) {
                cnt++;
            }
            m >>= 1;
            n >>= 1;
        }
        return cnt;
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int m = sc.nextInt();
        int n = sc.nextInt();
        System.out.println(countDif(m, n));
    }
}