use proconio::input;

fn main() {
    input! {
        r: u32,
        p: u32,
        q: u32,
        a: u32,
        b: u32,
        c: u32,
        d: u32,
    }

    let mut ok = 0u32;
    let mut ng = 1_000_000_001;
    let sum = a + b + c + d;
    while ng - ok > 1 {
        let mid = (ok + ng) / 2;
        if mid * 3 > sum {
            ng = mid;
            continue;
        }
        let need2 = mid.saturating_sub(a) + mid.saturating_sub(b) + mid.saturating_sub(c);
        let cost = q as u64 * need2 as u64 + p as u64 * mid as u64;
        if cost > r as u64 {
            ng = mid;
        } else {
            ok = mid;
        }
    }
    println!("{ok}");
}