func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n, m = 1, a, t1 = 1, tong = 0;     cin >> n;     while (1) {       tong += t1;       if (tong > n) {         cout << --m;         return 0;       }       t1 += ++m;     }     return 0;   }   