func_code_string: #include <bits/stdc++.h>   #pragma warning(disable : 4996)   using namespace std;   int main() {     int h, w, k, count = 0;     scanf( %d %d %d , &h, &w, &k);     for (size_t i = 0; i < k; i++) {       if (h == 1 && w == 1) {         count++;       } else if (h == 1) {         count += w;       } else if (w == 1) {         count += h;       } else {         count += (h * 2) + (w - 2) * 2;       }       h -= 4;       w -= 4;     }     printf( %d n , count);     return 0;   }   