#include <bits/stdc++.h>   using std::cin;   using std::cout;   using std::endl;   using std::sort;   using std::string;   using std::swap;   int main() {     int times = INT_MAX;     int a[6];     while (times-- && ~scanf( %d , &a[0])) {       for (int i = 1; i < 6; ++i) scanf( %d , a + i);       printf( %d n , (a[0] + a[1] + a[2]) * (a[0] + a[1] + a[2]) - a[0] * a[0] -                          a[2] * a[2] - a[4] * a[4]);     };     return 0;   };   