#include <iostream>
using namespace std;
int main() {
	int A, B;
	cin >> A >> B;
	int ans = 1;
	while (A != 0 || B != 0) {
		if (A % 2 == 1) {
			if (B % 2 == 1) {
				ans *= 2;
			}
			else {
				ans = 0;
			}
		}
		A >>= 1;
		B >>= 1;
	}
	cout << ans;
	return 0;
		
}