#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<long long> VL;
typedef vector<VL> VVL;
typedef long long LL;
#define all(a) (a).begin(), (a).end()
#define Yes(n) cout << ((n) ? "Yes" : "No"  ) << endl
#define YES(n) cout << ((n) ? "YES" : "NO"  ) << endl
#define ALL(a)  (a).begin(),(a).end()
#define pb push_back

int main() {
  int a,b;cin>>a>>b;
  int ans=1;
  rep(i,10){
    int p=a%2,q=b%2;
    if(p==1&&q==0){ans=0;}
    if(p==1&&q==1){ans*=2;}
    a/=2;b/=2;
  }
  cout<<ans<<endl;
}