n, A, B, X, Y = map(int, input().split())
H = list(map(int, input().split()))

def ok(k):
    lst = []
    a, b, x, y = A, B, X, Y
    for i in range(n):
        h = H[i] - k
        if h <= 0:
            continue
        c = h // x
        h -= min(a, c) * x
        a -= min(a, c)
        if h > 0:
            lst.append(h)
    lst.sort(reverse = True)
    lst = lst[a:]
    return sum(lst) <= y * b
    

l = -1
r = 1 << 30
while r - l > 1:
    mid = (l + r) // 2
    if ok(mid):
        r = mid
    else:
        l = mid
print(r)