func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n;     cin >> n;     int v = 3 - n % 3, ans = 0;     for (int i = v;; i += 3) {       if (1LL * i * (i + 1) / 2 > (n + i) / 3) break;       ++ans;     }     cout << ans;     return 0;   }   