//#include <atcoder/all>
//using namespace atcoder;
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(v) v.begin(),v.end()
typedef long long ll;
#define int ll
using ld = long double;
using vi = vector<int>;
using vs = vector<string>;
using P = pair<int,int>;
template<typename T> bool chmax(T &a, const T b) {if (a < b) {a = b; return true;} else return false; }
template<typename T> bool chmin(T &a, const T b) {if (a > b) {a = b; return true;} else return false; }
const int INF = 1e18;
//using mint = modint1000000007;
//using mint = modint998244353;
int n,a,b,x,y;

bool solve(priority_queue<int> q,int k,int a,int b){
   while(q.size()){
      int t = q.top()-k;q.pop();
      if(t<0)continue;
      if(a>0){
         if(t>=x){
            int c = t/x;
            t-=c*x;
            a-=c;
            if(t>0)q.push(t+k);
         }
         else a--;
      }
      else{
         b-=t;
      }
   }
   return b>=0;

}
signed main() {
   cin.tie(0);
   ios_base::sync_with_stdio(false);
   cout << fixed << setprecision(20);

   
   cin>>n>>a>>b>>x>>y;
   priority_queue<int> q;
   rep(i,n){
      int h;cin>>h;
      q.push(h);
   }
   b*=y;
   int ng = -1;
   int ok = INF;
   while(abs(ng-ok)>1){
      int mid = (ng+ok)/2;
      if(solve(q,mid,a,b))ok=mid;
      else ng = mid;
   }

   cout << ok <<"\n";
   return 0;
}