func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, x;     cin >> n;     if (n % 2 == 0) {       x = n / 2;       cout << x * (x + 1);     } else {       x = (n + 1) / 2;       cout << (x - 1) * x + x;     }     return 0;   }   