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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll R, P, Q, A, B, C, D;
    cin >> R >> P >> Q >> A >> B >> C >> D;
    ll ok = 0, ng = (A + B + C + D) / 3 + 1;
    while(ng - ok > 1) {
        ll mid = (ng + ok) / 2;
        ll r = mid * P + (max(0LL, mid - A) + max(0LL, mid - B) + max(0LL, mid - C)) * Q;
        if(R < r) ng = mid;
        else ok = mid;
    }
    cout << ok << endl;
}