func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = (int)1e9;   const double pi = acos(-1.0);   const double eps = 1e-9;   long long x, second, res, xx, first;   int main() {     cin >> second >> x;     xx = x;     if ((second & 1) != (x & 1)) {       cout << 0;       return 0;     }     res = 1;     while (xx) {       if (xx & 1) res *= 2;       xx /= 2;     }     if (second == x) {       cout << res - 2;       return 0;     }     first = second - x;     if (first < 0) {       cout << 0;       return 0;     }     for (int i = 0; i <= 50; i++) {       long long z = (1ll << (i));       long long zz = (1ll << (i + 1));       if ((x & z) > 0 && (first & zz) > 0) {         cout << 0;         return 0;       }     }     cout << res;     return 0;   }   