559A - Gerald's Hexagon - CodeForces Solution

#include <iostream>

using namespace std;

int main(int argc, char const *argv[]) {
	unsigned int a, b, c, d, e, f;
	cin >> a >> b >> c >> d >> e >> f;

	cout << (a+b+c)*(a+b+c) - a*a - c*c - e*e << endl;

	return 0;
}