func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAX_BUF_SIZE = 16384;   char BUFOR[MAX_BUF_SIZE];   int BUF_SIZE, BUF_POS;   char ZZZ;   const int MXN = 1000010;   const int C = 262144;   const int INF = 1000000001;   void test() {     int n;     scanf( %d , &n);     cout << ((long long int)(n - 1) * (n - 3) + 1) << endl;   }   int main() {     int te = 1;     while (te--) test();     return 0;   }   