#include <bits/stdc++.h>
#include <atcoder/all>

using namespace std;
using ll = long long;
#define rep(i, s, t) for (ll i = s; i < (ll)(t); i++)
#define all(x) begin(x), end(x)
template <class T> bool chmin(T& x, T y) {
	return x > y ? (x = y, true) : false;
}
template <class T> bool chmax(T& x, T y) {
	return x < y ? (x = y, true) : false;
}

void solve() {
	ll r, p, q;
	cin >> r >> p >> q;
	ll a, b, c, d;
	cin >> a >> b >> c >> d;
	ll up = 1e9 + 1;
	ll dw = 0;
	while (up - dw > 1) {
		ll md = (up + dw) / 2;
		ll dd = d;
		if (a > md) dd += a - md;
		if (b > md) dd += b - md;
		if (c > md) dd += c - md;
		ll nc = max(0ll, md - a) + max(0ll, md - b) + max(0ll, md - c);
		if (dd >= nc && r >= md * p + nc * q) dw = md;
		else up = md;
	}
	cout << dw << '\n';
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout << fixed << setprecision(15);
	int t = 1;
	// cin >> t;
	while (t--) solve();
}