#include <stdio.h>

int main(void) {
	long long d, n;
	scanf("%lld %lld", &d, &n);
	
	long long count = 0;
	while(d > 0 || n > 0){
		long long bit_1 = d % 2;
		long long bit_2 = n % 2;
		if(bit_1 != bit_2){
			count += 1;
		}
		d = d / 2;
		n = n / 2; 
	}
	printf("%lld", count);
	return 0;
}