def is_ok(k,a,b,x,y):
  c=[max(0,i-k) for i in h]
  for i in range(n):
    d=min(a,c[i]//x)
    a-=d
    c[i]-=x*d
  c.sort(reverse=True)
  for i in range(n):
    if a>0:
      c[i]=0
      a-=1
  if sum(c)<=b*y:
    return True
  else:
    return False

n,a,b,x,y=map(int,input().split())
h=list(map(int,input().split()))
ng,ok=-1,10**9
while ok-ng>1:
  mid=(ng+ok)//2
  if is_ok(mid,a,b,x,y):
    ok=mid
  else:
    ng=mid
print(ok)