#include<iostream>
#include<algorithm>
#include<functional>
using namespace std;

int main()
{
	int l[3], c[3];
	cin >> l[0] >> l[1] >> l[2];
	cin >> c[0] >> c[1] >> c[2];
	sort(l, l + 3, greater<int>());
	sort(c, c + 3);
	cout << (l[0] + l[1]) * 2 * c[0] + (l[0] + l[2]) * 2 * c[1]
		+ (l[1] + l[2]) * 2 * c[2] << endl;
	return 0;
}