#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}
int n, a, b;
long long x, y;
bool check(vector<long long> &hh, long long H) {
    vector<long long> h(hh);
    int a_res = a;
    for (int i = 0; i < n; i++) {
        h[i] = max(0LL, h[i] - H);
        long long cnt = min((long long)a_res, h[i] / x);
        h[i] -= cnt * x;
        a_res -= cnt;
    }

    if (a_res >= n) {
        return true;
    }
    sort(h.rbegin(), h.rend());
    long long su = 0;
    for (int i = a_res; i < n; i++) {
        su += h[i];
    }
    if (su <= y * b) {
        return true;
    } else {
        return false;
    }
}
int main() {
    fast_io();
    cin >> n >> a >> b >> x >> y;
    vector<long long> h(n);
    for (int i = 0; i < n; i++) {
        cin >> h[i];
    }
    long long ng = -1, ok = 4e9;
    while (ok - ng > 1) {
        long long mid = (ok + ng) / 2;
        if (check(h, mid)) {
            ok = mid;
        } else {
            ng = mid;
        }
    }
    cout << ok << endl;
}