#include <stdio.h>

int main() {
    int i = 0;
    int j = 0;
    int count = 0;
    scanf("%d %d",&i,&j);
    int tom =i^j;
    while(tom)
    {
        tom=tom&(tom-1);
        count++;
    }
    printf("%d ",count);
    return 0;
}