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: 2048}, e => -Infinity);
let r = 0;
for (let i = 0; i <= m; i++) {
	dp[i & 2047] = r = Math.max(
		dp[(i - a1) & 2047] + b1,
		dp[(i - a2) & 2047] + b2,
		dp[(i - a3) & 2047] + b3,
		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)}`);