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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
 
    int a,b; cin >> a >> b;
    int answer = 1;
    for(int i=0; i<20; i++){
        if(a&(1<<i)){
            if(b&(1<<i)) answer *= 2;
            else answer = 0;
        }
    }   
    cout << answer << endl;
}