# include <bits/stdc++.h>
using namespace std;
int main() {
	int m, n;
	long long sum = 0, cnt = 0;
	long long c, p1, p2, s1, s2;
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> c;
		sum += c;
		cnt += c * i;
	}
	cin >> m >> p1 >> s1 >> s2;
	sum += s1;
	cnt += p1 * s1;
	sum += s2;
	cnt -= sum * m;
	p2 = -(cnt - s2 / 2) / s2;
	if (p2 < 1) {
		p2 = 1;
	} else if (p2 > n) {
		p2 = n;
	}
	cout << p2;
	return 0;
}