# frozen_string_literal: true

N = gets.to_i
A = gets.split.map(&:to_i)
M = gets.to_i
B = gets.split.map(&:to_i).sort.reverse

ans = 100
A.permutation(N) do |list|
  box = B.dup
  index = 0
  ok = false
  list.each_with_index do |a, i|
    while index < box.size
      if box[index] >= a
        box[index] -= a
        ok = true if i == list.size - 1
        break
      else
        index += 1
      end
    end
  end
  ans = [index, ans].min if ok
end

if ans == 100
  puts '-1'
else
  puts ans + 1
end