func_code_string: #include <bits/stdc++.h>   using namespace std;   int INF = 2147483647;   int inf = -2147483648;   const double PI = acos(-1.0);   const double pi = 2 * asin(1.0);   int vis[1000009];   int vi[1000009];   int main() {     ios::sync_with_stdio(false);     int a, b, c, d;     cin >> a >> b >> c >> d;     for (int i = 0; i <= 100; i++) {       vis[b + a * i] = 1;     }     for (int i = 0; i <= 100; i++) {       vi[d + c * i] = 1;     }     for (int i = 0; i < 1000009; i++) {       if (vis[i] == 1 && vi[i] == 1) {         cout << i << endl;         return 0;       }     }     cout << -1 << endl;     return 0;   }   