N, A, B, X, Y = map(int, input().split())
H = tuple(map(int, input().split()))


def solve(N, A, B, X, Y, H, K):
    Hl = list(H)
    for i in range(N):
        Hl[i] = max(Hl[i] - K, 0)

    for i in range(N):
        div = Hl[i] // X
        if div <= A:
            Hl[i] -= div * X
            A -= div
        else:
            Hl[i] -= A * X
            A = 0

    if A >= N:
        return True
    elif A:
        Hl.sort(reverse=True)
        # 前からA番目までは潰せる
        return sum(Hl[A:]) <= B * Y
    else:
        return sum(Hl) <= B * Y


l, r = -1, 10 ** 9
while r - l > 1:
    m = (r + l) // 2
    if solve(N, A, B, X, Y, H, m):
        r = m
    else:
        l = m
print(r)