func_code_string: #include <bits/stdc++.h>   using namespace std;   void fun() {}   signed main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     ;     fun();     long long int c, v, u, a, l, p = 0, ans = 1;     cin >> c >> v >> u >> a >> l;     p += v;     while (p < c) {       v += a;       p += min(v, u) - l;       ans++;     }     cout << ans;     cerr <<  time elapsed :   << 1.0 * clock() / CLOCKS_PER_SEC <<   sec  n ;     return 0;   }   