#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    long long r, p, q;
    cin >> r >> p >> q;
    long long a, b, c, d;
    cin >> a >> b >> c >> d;
    long long le = 0, ri = 2e9 + 1;
    while (ri - le > 1) {
        long long mid = (le + ri) / 2;
        long long t = max(mid - a, 0LL) + max(mid - b, 0LL) + max(mid - c, 0LL);

        if (mid * p + t * q <= r && t <= d) {
            le = mid;
            // cout << mid << " " << t << endl;
        } else {
            ri = mid;
        }
    }
    cout << le << '\n';
    return 0;
}