n,a,b,x,y = map(int,input().split())
h = list(map(int,input().split()))
from heapq import heappush, heappop
ng,ok = -1,10**9
while ok-ng>1:
	k = (ok+ng)//2
	hq = []
	for i in h:
		heappush(hq,min(0,k-i))
	for i in range(a):
		t = heappop(hq)
		t = min(0,t+x)
		heappush(hq,t)
	if -sum(hq)<=b*y: ok = k
	else: ng = k
print(ok)