let l = require("fs").readFileSync("/dev/stdin", "utf8").trim().split("\n");
let n = parseInt(l[0]);
let [a1, b1] = l[1].split(" ").map(s => parseInt(s));
let [a2, b2] = l[2].split(" ").map(s => parseInt(s));
let [a3, b3] = l[3].split(" ").map(s => parseInt(s));

if (a2 * b1 < a1 * b2) {
	[a1, b1, a2, b2] = [a2, b2, a1, b1];
}
if (a3 * b1 < a1 * b3) {
	[a1, b1, a3, b3] = [a3, b3, a1, b1];
}
let w = Math.max(Math.floor(n / a1) - a2 - a3, 0);
let m = n - w * a1;
let dp = Array.from({length: m + 1});
dp[0] = 0;
let r = 0;
for (let i = 1; i <= m; i++) {
	dp[i] = r = Math.max(
		i >= a1 ? dp[i - a1] + b1 : 0,
		i >= a2 ? dp[i - a2] + b2 : 0,
		i >= a3 ? dp[i - a3] + b3 : 0,
		r
	);
}
// ここでBigIntを使わないと精度不足になる
console.log(`${BigInt(r) + BigInt(w) * BigInt(b1)}`);