func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     long long ans = 0;     long long a, b, c, s;     cin >> s >> a >> b >> c;     ans = s / c + (s / c / a) * b;     cout << ans << endl;   }   int main() {     int T;     cin >> T;     while (T--) solve();     return 0;   }   