#include <bits/stdc++.h>
using namespace std;

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

int main() {
	int a, b;
	cin >> a >> b;
	vector<int> va(8), vb(8);
	int i = 0;
	while(a) {
		va[i] = a % 2;
		a /= 2;
		i++;
	}
	i = 0;
	while(b) {
		vb[i] = b % 2;
		b /= 2;
		i++;
	}
	int c = 0;
	rep(j, 8) {
		if(va[j]) {
			if(vb[j] == 0) {
				cout << 0 << endl;
				return 0;
			}
			c++;
		}
	}
	cout << (1 << c) << endl;
}