func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long cnt1, cnt2, x, y;     cin >> cnt1 >> cnt2 >> x >> y;     long long low = 1, high = 4000000000LL;     if (x == y) {       while (low < high) {         long long mid = low + (high - low) / 2;         if (mid - mid / x >= cnt1 + cnt2)           high = mid;         else           low = mid + 1;       }     } else {       while (low < high) {         long long mid = low + (high - low) / 2;         if (mid - mid / x >= cnt1 && mid - mid / y >= cnt2 &&             mid - mid / (x * y) >= cnt1 + cnt2)           high = mid;         else           low = mid + 1;       }     }     cout << low;   }   