import sys

def ok(m):
  nh = []
  for i in h:
    nh.append(i-m)
  na = a
  for i in range(n):
    if nh[i] >= x:
      v = min(na,nh[i]//x)
      na -= v
      nh[i] -= v*x
    if na <= 0:
      break
  nh.sort()
  s = 0
  for i in range(n-1,-1,-1):
    if na > 0 and nh[i] > 0:
      na -= 1
      nh[i] -= x
    if nh[i] > 0:
      s += nh[i]
  if s <= b*y:
    return True
  return False
    
  

n,a,b,x,y = map(int,input().split())
h = list(map(int,sys.stdin.readline().split()))
h.sort()
l = 0
r = 10**9
while r - l > 1:
  m = (r + l) // 2
  if ok(m):
    r = m
  else:
    l = m
if ok(l):
  print(l)
else:
  print(r)