#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(n); i++)


int main(){
    i64 N, A, B, X, Y; cin >> N >> A >> B >> X >> Y;
    vector<i64> H(N);
    for (auto& h : H) cin >> h;

    auto solver = [&](i64 k)->bool {
        i64 a = A;
        vector<i64> newH;
        for (auto& h : H) {
            i64 hh = max<i64>(0, h - k);
            i64 adec = min<i64>(a, hh / X);
            newH.push_back(hh - adec * X);
            a -= adec;
        }
        sort(newH.begin(), newH.end());
        i64 sumH = 0;
        for (auto& h : newH) sumH += h;
        if (a >= N) return true;
        for (int i = 0; i < a; i++) { sumH -= newH.back(); newH.pop_back(); }
        return sumH <= B * Y;
    };

    i64 l = -1, r = 1001001001;
    while (r - l > 1) {
        i64 m = (l + r) / 2;
        if (solver(m)) r = m; else l = m;
    }

    cout << r << endl;

    return 0;
}




struct ios_do_not_sync {
    ios_do_not_sync() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;