N,A,B,X,Y=map(int,input().split())
H=list(map(int,input().split()))
L,R=0,10**9
from heapq import *
def f(m):
  Q=[]
  heapify(Q)
  for i in range(N):
    heappush(Q,-max(0,H[i]-m))
  for i in range(A):
    x=heappop(Q)
    x=-x
    heappush(Q,-max(0,x-X))
  s=0
  while len(Q):
    s-=heappop(Q)
  if s<=B*Y:
    return 1
  else:
    return 0

while L<R:
  M=(L+R)>>1
  if f(M):
    R=M
  else:
    L=max(L+1,M)
print(L)