#include <stdio.h>

int main() 
{
    int a = 0;
    int b = 0;
    int c = 0;
    scanf("%d %d",&a,&b);
    c = a ^ b;
    int count = 0;
    while(c)
    {
        count++;
        c = c & (c - 1);
    }
    printf("%d\n",count);
    
    return 0;
}