import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int a = sc.nextInt();
        int b = sc.nextInt();
        int x = sc.nextInt();
        long y = sc.nextInt();
        int[] helths = new int[n];
        for (int i = 0; i < n; i++) {
            helths[i] = sc.nextInt();
        }
        PriorityQueue<Integer> queue = new PriorityQueue<>();
        int left = -1;
        int right = 1000000000;
        while (right - left > 1) {
            int m = (left + right) / 2;
            for (int i = 0; i < n; i++) {
                if (helths[i] - m > 0) {
                    queue.add(m - helths[i]);
                }
            }
            for (int i = 0; i < a && queue.size() > 0; i++) {
                int z = -queue.poll();
                if (z > x) {
                    queue.add(x - z);
                }
            }
            long sum = 0;
            while (queue.size() > 0) {
                sum -= queue.poll();
            }
            if (sum <= b * y) {
                right = m;
            } else {
                left = m;
            }
        }
        System.out.println(right);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String nextLine() throws Exception {
        return br.readLine();
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}