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

#define rep(i, x) for(int i = 0; i < (x); i++)

int main() {
	int n, a, b, x, y;
	cin >> n >> a >> b >> x >> y;
	vector h(n, 0);
	for(auto &v : h) cin >> v;

	auto f = [&](int k) {
		priority_queue<int> pq;
		for(auto &v : h) pq.push(v - k);
		rep(i, a) {
			if(pq.top() <= 0) break;
			pq.push(pq.top() - x);
			pq.pop();
		}
		long long sum = 0;
		while(!pq.empty()) {
			sum += max(pq.top(), 0);
			pq.pop();
		}
		return sum <= (long long)y * b;
	};

	int ok = 1000000000, ng = -1;
	while(ok - ng > 1) {
		int mid = (ok + ng) >> 1;
		(f(mid) ? ok : ng) = mid;
	}

	cout << ok << '\n';
}