func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[10];   int main() {     for (int i = 1; i <= 6; i++) cin >> a[i];     cout << (a[1] + a[2] + a[3]) * (a[1] + a[2] + a[3]) - a[1] * a[1] -                 a[3] * a[3] - a[5] * a[5];     return 0;   }   