#include <algorithm> // max
#include <iostream> // cin, cout, endl
#include <utility> // swap
#include <vector> // vector
using ll = long long;
// O(A^2) DP解法
// 入力制約: 0 <= n <= 10^13, 0 < a_i < 2048, 0 <= b_min, floor(n / a_min) * b_max <= 2^60
int main() {
	ll n, a1, b1, a2, b2, a3, b3;
	std::cin >> n >> a1 >> b1 >> a2 >> b2 >> a3 >> b3;
	if (a2 * b1 < a1 * b2) {
		std::swap(a1, a2);
		std::swap(b1, b2);
	}
	if (a3 * b1 < a1 * b3) {
		std::swap(a1, a3);
		std::swap(b1, b3);
	}
	ll w = std::max(n / a1 - a2 - a3, 0LL), m = n - w * a1, r = w * b1;
	std::vector<ll> dp(m + 1, 0LL);
	for (ll i = 0; i <= m; i++) {
		dp[i] = r = std::max({
			i >= a1 ? dp[i - a1] + b1 : 0,
			i >= a2 ? dp[i - a2] + b2 : 0,
			i >= a3 ? dp[i - a3] + b3 : 0,
			r,
		});
	}
	std::cout << r << std::endl;
	return 0;
}