func_code_string: #include <bits/stdc++.h>   using namespace std;   signed long long n, m, answer;   signed long long calc(signed long long n, signed long long m) {     signed long long answer;     if (m - n >= 1) {       answer = n;     } else {       answer =           m + (signed long long)ceil((sqrt(1.0L + 8.0L * (n - m)) - 1.0L) / 2.0L);     }     return answer;   }   int main() {     cin >> n >> m;     cout << calc(n, m);     return 0;   }   