#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using V = vector<ll>;
using VV = vector<V>;
using VVV = vector<VV>;
using VS = vector<string>;
using VB = vector<bool>;
using VVB = vector<VB>;
using P = pair<ll,ll>;
using M = map<ll,ll>;
using Q = queue<ll>;
using PQ = priority_queue<ll>;
using PQG = priority_queue<ll,V,greater<ll>>;
using S = set<ll>;
using VP = vector<P>;
const ll MOD = 1000000007;
const ll mod = 998244353;
const ll INF = 1LL << 60;
#define rep(i,n) for(ll i = 0; i < n; i++)
#define rep2(i,s,n) for(ll i = s; i < n; i++)
#define per(i,n) for(ll i = n-1; i >= 0; i--)
#define per2(i,s,n) for(ll i = n-1; i >= s; i--)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define lb lower_bound
#define ub upper_bound
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
template<class T>void Vin(vector<T>&a){rep(i,(int)a.size())cin>>a[i];}
template<class T>void Vout(const vector<T>&a){rep(i,(int)a.size())cout<<a[i]<<endl;}
ll power(ll a,ll b,const ll&M){a%=M;ll res=1;while(b>0){if(b&1)res=res*a%M;a=a*a%M;b>>=1;}return res;}
const ll H[4] = {0,1,0,-1}, W[4] = {1,0,-1,0};

int main() {
  ll n, aa, b, x, y;
  cin >> n >> aa >> b >> x >> y;
  V hh(n);
  Vin(hh);
  sort(rall(hh));
  ll wa = 0, ac = 1000000000;
  while(ac-wa > 1) {
    ll mid = (wa+ac)/2, a = aa;
    V h(n);
    rep(i,n) h[i] = max(hh[i]-mid,0LL);
    //if (mid == 5) rep(i,n) cout << h[i] << endl;
    bool frag = 0;
    ll i = 0;
    while(a) {
      if(h[i] < x) break;
      ll c = min(h[i]/x,a);
      h[i] -= c*x;
      a -= c;
      i++;
    }
    sort(rall(h));
    ll sum = 0;
    //if (mid == 5) rep(i,n) cout << h[i] << endl;
    rep2(j,a,n) {
      if(h[j] <= 0) break;
      sum += h[j];
      if(sum > y*b) {
        frag = 1;
        break;
      }
    }
    if(frag) wa = mid;
    else ac = mid;
    //cout << mid << endl;
  }
  cout << ac << endl;
}