func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   using vi = vector<int>;   using vvi = vector<vi>;   using vll = vector<ll>;   using vvll = vector<vll>;   using vb = vector<bool>;   using vd = vector<double>;   using vs = vector<string>;   using vpii = vector<pair<int, int>>;   using vpll = vector<pair<ll, ll>>;   using pii = pair<int, int>;   using pll = pair<ll, ll>;   int dx[8] = {0, 1, 1, 1, 0, -1, -1, -1};   int dy[8] = {1, 1, 0, -1, -1, -1, 0, 1};   void solve() {     vi a(6);     for (ll i = 0; i < 6; i++) cin >> a[i];     ;     ll ans = ((a[0] + a[1] + a[2]) * (a[0] + a[1] + a[2]) - a[0] * a[0] -               a[2] * a[2] - a[4] * a[4]);     cout << ans <<   n ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     ll t = 1;     while (t--) {       solve();     }   }   