from heapq import heapify, heappop, heappush

n, a, b, x, y = map(int, input().split())
H = list(map(int, input().split()))

left = 0
right = 10**9 + 1
while right - left > 1:
    mid = (left + right) // 2
    Hc = [0 for _ in range(n)]
    for i in range(n):
        Hc[i] = min(0, mid - H[i])
    heapify(Hc)
    for i in range(a):
        curr = heappop(Hc)
        curr = min(0, curr + x)
        heappush(Hc, curr)
    if -sum(Hc) <= b * y:
        right = mid
    else:
        left = mid
print(right)