func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long int n, k, ans = 0, fa = 0, c = 0;     cin >> n >> k;     c = (n * (n + 1)) / 2;     c -= k;     c -= n;     while (c > 0) {       fa++;       c -= n;       n--;     }     cout << fa;     return 0;   }   