func_code_string: #include <bits/stdc++.h>   using namespace std;   int fu[2003];   int jar[2003];   int main() {     int n, refresh;     cin >> n >> refresh;     for (int(i) = 0; (i) < (n); ++(i)) {       cin >> jar[i];     }     for (int(i) = 0; (i) < (n); ++(i)) {       cin >> fu[i];     }     int best = fu[0];     int res = 0;     int gas = 0;     for (int i = 0; i < n; ++i) {       gas += fu[i];       best = max((best), (fu[i]));       while (gas < jar[i]) {         gas += best;         res += refresh;       }       gas -= jar[i];       res += jar[i];     }     cout << res << endl;     return 0;   }   