func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long c, w, v, a, l, pages, days = 1;     cin >> c >> v >> w >> a >> l;     pages = v;     while (pages < c) {       v += a;       if (v > w) v = w;       pages = pages - l + v;       days++;     }     cout << days;   }   