func_code_string: #include <bits/stdc++.h>   using namespace std;   const int Nmax = 2e5 + 17;   inline int sqr(int x) { return x * x; }   int main(void) {     int a[6];     for (int i = 0; i < 6; i++) cin >> a[i];     cout << sqr(a[0] + a[1] + a[2]) - sqr(a[0]) - sqr(a[2]) - sqr(a[4]);   }   