program main
  implicit none
  integer::N
  integer*8,allocatable::d(:)
  integer::x,y,maxd,maxxy,count
  read *,n
  allocate(d(n))
  read *,d
  read *,x,y
  x = abs(x)
  y = abs(y)
  maxd = MAXVAL(d)
  maxxy= MAX(x,y)
  count = maxxy/maxd
  if(maxxy.eq.0) then
     print '(i0)', 0
  else if(ANY(maxxy.eq.d)) then
     print '(i0)', 1
  else if(2*maxd.ge.maxxy) then
     print '(i0)', 2
  else
     count = (maxxy - 2*maxd + maxd - 1)/maxd
     print '(i0)', count + 2
  end if
end program main