#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)
#define all(a) (a).begin(),(a).end()

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    int A, B;
    cin >> A >> B;
    
    ll ans = 1;
    rep(i, 0, 8) if (((A >> i) & 1) && !((B >> i) & 1)) ans = 0;
    rep(i, 0, 8) if (((A >> i) & 1) && ((B >> i) & 1)) ans *= 2;
    
    cout << ans << '\n';
}