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#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll sum_1(ll num)
{
    ll ans=0;
    while(num)
        ans++,num&=(num-1);
    return ans;
}
int main()
{
    ll n,m;
    while(scanf("%lld%lld",&n,&m)!=EOF)
    {
//        cout<<(n^(m>>1))<<","<< n+(m>>1)<<endl;
        if((n^(m>>1))==n+(m>>1)&&m%2==0)
            printf("%lld\n",1ll<<(sum_1(n)));
        else
            printf("0\n");
    }
    return 0;
}
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