# require 'pry'

n = gets.to_i
$d = gets.split.map(&:to_i)
x,y = gets.split.map(&:to_i)

M = 1000000000
raise unless n.between?(1, 15)
raise unless $d.all? { |d| d.between?(1, M) }
raise unless $d.uniq.size == n
raise unless x.between?(-M, +M)
raise unless y.between?(-M, +M)

def solve x
  if x == 0
    0
  elsif $d.include? x
    1
  elsif x <= 2*$dm
    x == $dm ? 1 : 2
  else
    jump = ([0, x - (2*$dm)].max + $dm - 1) / $dm
    jump + solve(x - jump*$dm)
  end
end

# binding.pry

$dm = $d.max
puts solve [x, y].max