#include <iostream>
using namespace std;
using ll = long long;

int main(void) {
	ll N, K;	cin >> N >> K;

	int ans = 0;
	int c = 0;
	ll R = N - K;

	while (R || K) {
		int a = R & 1;
		int b = K & 1;
		if (a + b + c >= 2) {
			ans += 1;
			c = 1;
		}
		else {
			c = 0;
		}
		R >>= 1;
		K >>= 1;
	}

	cout << ans << endl;
	return 0;
}