#include <bits/stdc++.h>//万能头文件
using namespace std;
int main() {
	int n, x, y;
	cin >> n >> x >> y;
	int a1, a2, a3, a4;
	cin >> a1 >> a2 >> a3 >> a4;
	int profit1 = (n / 10) * 4 * x;
	int profit2 = (n / 2) * y;
	int profit3 = n * (a1 + a2 + a3 + a4);
	int maxProfit = profit1;
	if (profit2 > maxProfit) {
		maxProfit = profit2;
	}
	if (profit3 > maxProfit) {
		maxProfit = profit3;
	}

	cout << maxProfit << endl;
	return 0//好习惯
}