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