#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>

using namespace std;

int main() {
	vector<int> L(3);
	vector<int> N(3);
	for (int i = 0; i < 3; ++i) {
		cin >> L[i];
	}
	for (int i = 0; i < 3; ++i) {
		cin >> N[i];
	}

	sort(L.begin(), L.end());
	sort(N.begin(), N.end(), greater<int>());

	int result = 0;
	result += (L[0] + L[1]) * N[0];
	result += (L[0] + L[2]) * N[1];
	result += (L[1] + L[2]) * N[2];
	result *= 2;

	cout << result << endl;

}