func_code_string: #include <bits/stdc++.h>   #pragma comment(linker,  /STACK:256000000 )   using namespace std;   template <class T>   double sqrt(T x) {     return sqrt((double)x);   }   template <class T>   T sqr(T x) {     return x * x;   }   const double PI = acos(-1.0);   const int INF = 1000000000;   const int MOD = 1000000007;   void wa() {     cout << 5;     exit(0);   }   void tl() {     while (1)       ;   }   void pe() {     cout <<  abc abc n 453534 wff sf sd n ;     exit(0);   }   void re() { exit(1); }   void ml() { int *b = new int[1000]; }   int main() {     double TIME_START = clock();     int n;     cin >> n;     unsigned long long ans = 1, lay;     if (n >= 2) {       lay = 12;       for (int x = 2; x <= n; x++) {         ans += lay;         lay += 12;       }     }     cout << ans;     fprintf(stderr,   n n%.15lf n n ,             (double)(clock() - TIME_START) / CLOCKS_PER_SEC);     return 0;   }   