#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int N,A,B;
long long x,y;

bool check(vector<long long> a){
	
	priority_queue<long long> Q;
	rep(i,N){
		Q.push(a[i]);
	}
	
	rep(i,A){
		auto t = Q.top();
		Q.pop();
		t -= x;
		Q.push(t);
	}
	long long AA = y*B;
	while(Q.size()>0){
		auto t = Q.top();
		Q.pop();
		AA -= max(0LL,t);
	}
	
	if(AA>=0)return true;
	else return false;
		
	
}

int main(){
	
	
	cin>>N>>A>>B;
	
	
	cin>>x>>y;
	vector<long long> a(N);
	rep(i,N)cin>>a[i];
	
	long long ok = Inf,ng = -1;
	while(ok-ng>1LL){
		long long mid = (ok+ng)/2;
		auto b = a;
		rep(i,N)b[i] -= mid;
		
		if(check(b))ok = mid;
		else ng = mid;
	}
	cout<<ok<<endl;
	
	
	return 0;
}