let l = require("fs").readFileSync("/dev/stdin", "utf8").trim().split("\n");
let n = BigInt(l[0]);
let [a0, b0] = l[1].split(" ").map((s) => BigInt(s));
let [a1, b1] = l[2].split(" ").map((s) => BigInt(s));
let [a2, b2] = l[3].split(" ").map((s) => BigInt(s));

function co_solve(n, a0, b0, a1, b1, a2, b2) {
	let r = 0n;
	for (let i = 0n; i < a0; i += 1n) {
		let d = n - i * a1;
		if (d < 0n) {
			break;
		}
		for (let j = 0n; j < a0; j += 1n) {
			let t = d / a0 * b0 + i * b1 + j * b2;
			if (r < t) {
				r = t;
			}
			d -= a2;
			if (d < 0n) {
				break;
			}
		}
	}
	return r;
}

let r1 = co_solve(n, a0, b0, a1, b1, a2, b2);
let r2 = co_solve(n, a1, b1, a2, b2, a0, b0);
let r3 = co_solve(n, a2, b2, a0, b0, a1, b1);

let r = r1;
if (r < r2) {
	r = r2;
}
if (r < r3) {
	r = r3;
}

console.log(r.toString());