// O(A^2)解法
fn solve(n: u64, ab: &[(u64, u64); 3]) -> u64 {
    assert!(n > 0 && n <= 10_0000_0000_0000);
    assert!(ab
        .iter()
        .all(|&(a, b)| a > 0 && a <= 100000 && b > 0 && b.saturating_mul(n / a) <= (1u64 << 61)));
    let co_solve = |n: u64, ab: &[(u64, u64); 3]| -> u64 {
        let [(a0, b0), (a1, b1), (a2, b2)] = *ab;
        // a0inv = ceil(2^63 / a0)
        let a0inv = ((1u64 << 63) - 1) / a0 + 1;
        let mut r = 0;
        for (i, di) in (0..a0).zip((0..=n).rev().step_by(a1 as usize)) {
            for (j, dj) in (0..a0).zip((0..=di).rev().step_by(a2 as usize)) {
                // 準定数を除数とする除算の定数倍高速化
                // 0 < a0 <= 10^5, 0 <= d <= n <= 10^13 < 2^63/10^5 <= 2^63 / a0 <= ceil(2^63 / a0) = a0inv < ((2^63 / a0) + 1)
                // quot = floor((n - (i * a1 + j * a2)) / a0) = floor(d / a0) = floor((d * 2) * ceil(2^63 / a0) / 2^64) - (0 または 1)
                let qsim = ((((dj * 2) as u128) * (a0inv as u128)) >> 64) as u64;
                let quot = qsim - u64::from(dj.checked_sub(qsim * a0).is_none());
                debug_assert_eq!(dj / a0, quot);
                r.chmax(quot * b0 + i * b1 + j * b2);
            }
        }
        r
    };
    [
        co_solve(n, &[ab[0], ab[1], ab[2]]),
        co_solve(n, &[ab[1], ab[2], ab[0]]),
        co_solve(n, &[ab[2], ab[0], ab[1]]),
    ]
    .iter()
    .copied()
    .max()
    .unwrap()
}

fn main() {
    let tins = std::time::Instant::now();
    let mut input = String::with_capacity(1024);
    std::io::Read::read_to_string(&mut std::io::stdin(), &mut input).unwrap();
    let mut tokens = input.split_whitespace();
    let n = tokens.next().unwrap().parse::<u64>().unwrap();
    let ab = [
        (
            tokens.next().unwrap().parse::<u64>().unwrap(),
            tokens.next().unwrap().parse::<u64>().unwrap(),
        ),
        (
            tokens.next().unwrap().parse::<u64>().unwrap(),
            tokens.next().unwrap().parse::<u64>().unwrap(),
        ),
        (
            tokens.next().unwrap().parse::<u64>().unwrap(),
            tokens.next().unwrap().parse::<u64>().unwrap(),
        ),
    ];
    eprint!(
        "{}\n{} {}\n{} {}\n{} {}\n",
        n, ab[0].0, ab[0].1, ab[1].0, ab[1].1, ab[2].0, ab[2].1
    );
    let result = solve(n, &ab);
    println!("{}", result);
    eprintln!("time: {}ms", tins.elapsed().as_millis());
}

trait Change {
    fn chmax(&mut self, x: Self);
    fn chmin(&mut self, x: Self);
}
impl<T: PartialOrd> Change for T {
    fn chmax(&mut self, x: T) {
        if *self < x {
            *self = x;
        }
    }
    fn chmin(&mut self, x: T) {
        if *self > x {
            *self = x;
        }
    }
}