func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a[6];     for (int i = 0; i < 6; i++) {       cin >> a[i];     }     cout << (a[0] + a[1] + a[2]) * (a[0] + a[1] + a[2]) - (a[0] * a[0]) -                 (a[2] * a[2]) - (a[4] * a[4])          << endl;   }   