#include <bits/stdc++.h>
#define KE ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
using namespace std;
#define int long long

#define flt(x) cout << fixed << setprecision(x);
#define all(x) (x).begin(), (x).end()
#define bcount(t) __builtin_popcount(t)
#define Mod(x,m) (((x) % m + m) % m)
#define flip(x) reverse(x)
#define lowbit(x) (x&(-x))
#define bemax(x,y) x = max(x, y)
#define pb push_back
#define elif else if
#define endl '\n'
#define AA cerr << "AA" << endl;
#define  __ << " " <<

const int N = 1e6 + 10;
const int inf = 1e18;
const int mod = 1e9 + 7;
typedef pair<int, int> pii;

int n,k,m,c,d;
vector<int> a(N), tag(N), f(N);
//int tag[N], f[N];
int maxn;

bool check(int x){
	for(int i = 0; i < N; i++){
		tag[i] = 0, f[i] = 0;
	}
	int res=0;
	int lst = c + (m - 1) * d;
	for(int i=1;i<=n;i++){
		if(a[i]>=x){
			res++;
			tag[i]=1;
			if(res>=k) return true;
		}
	}
	for(int i = 0; i < m; i++){
		if(a[i] + c + i * d >= x){
			f[m]++;
			int xx = (k - c) * d;
			int det = i - xx;
			f[max(m + det,0ll)]--;
		}
	}
	for(int i = m; i < n; i++){
		if(tag[i] == 1) continue;
		if(a[i] + lst >= x){
			f[i]++;
			if(a[i] + c >= x) f[min(i + m, n)]--;
			else{
				int xx = (k - c) / d;
				int det = m - xx;
				f[max(i + det, 0ll)]--;
			}	
		}
	}
	for(int i = m - 1; i < n; i++){
		if(res >= k){
			return 1;
		}
		res += f[i];
	}
	return false;
}
void solve(){
	cin>>n>>k>>m>>c>>d;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	int ll=0, rr=1e18;
	maxn=c+(m-1)*d;
	while(ll<rr){
		int mid=(ll+rr+1)/2;
		if(check(mid))
		{
		   ll=mid;
		}
		else rr=mid-1;
	}
	cout<<ll<<endl;
}

signed main(){
	KE;
	int T = 1;
//	cin >> T;
//  flt(3);
	while(T--){
		solve();
	}
	return 0;
}