from sys import stdin
from heapq import heappush, heappop

n, a, b, x, y, *h = map(int, stdin.read().split())
left = -1
right = 10**9+1
while right - left >= 2:
    mid = (right + left) // 2
    hq = []
    for i in range(n):
        if h[i] - mid > 0:
            heappush(hq, -(h[i]-mid))
    for i in range(a):
        if hq:
            now = -heappop(hq)
            if now > x:
                kari = now - x
                heappush(hq, -kari)
    kari = 0
    while hq:
        kari += -heappop(hq)
    if kari <= b * y:
        right = mid
    else:
        left = mid

print("{}".format(right))