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