"""

"""

import sys
from sys import stdin

def solve(K):

    h = [max(0,i-K) for i in H]
    a = A
    b = B
    x = X
    y = Y

    for i in range(N):
        mov = min(a , h[i] // x)
        h[i] -= mov * x
        a -= mov

    h.sort()
    h.reverse()
    for i in range(N):
        if h[i] > 0 and a > 0:
            a -= 1
            h[i] = 0

    if sum(h) <= Y*B:
        return True
    else:
        return False

N,A,B,X,Y = map(int,stdin.readline().split())
H = list(map(int,stdin.readline().split()))

l = -1
r = 10**9

while r-l != 1:

    m = (l+r)//2
    if solve(m):
        r = m
    else:
        l = m

print (r)