n = gets.to_i
n0 = 11
n1 = 2 ** n0
own_list = gets.split.map(&:to_i)
exp_list = gets.split.map{|s|s.to_i / 2}
org_mon_list = [0]
own_list.each do |level|
  point = level << n0
  i = org_mon_list.size
  org_mon_list << point
  while i > 1
    j = i / 2
    parent = org_mon_list[j]
    if point < parent
      org_mon_list[i] = parent
      org_mon_list[j] = point
      i = j
    else
      break
    end
  end
end
org_mon_list << ((10001 + 5000 * n) << n0)
low_count = 1500
n.times do |i|
  mon_list = org_mon_list.clone
  max_count = 0
  n.times do |j|
    exp = exp_list[(i + j) % n]
    target = mon_list[1] + (exp << n0) + 1
    count = target % n1
    max_count = count if count > max_count
    k = 1
    mon_list[1] = target
    while (k0 = 2 * k) <= n
      k1 = k0 + 1
      k0_mon = mon_list[k0]
      k1_mon = mon_list[k1]
      if k0_mon < target
        if k1_mon < target
          if k0_mon < k1_mon
            mon_list[k] = k0_mon
            mon_list[k0] = target
            k = k0
          else
            mon_list[k] = k1_mon
            mon_list[k1] = target
            k = k1
          end
        else
          mon_list[k] = k0_mon
          mon_list[k0] = target
          k = k0
        end
      elsif k1_mon < target
        mon_list[k] = k1_mon
        mon_list[k1] = target
        k = k1
      else
        break
      end
    end
  end
  low_count = max_count if max_count < low_count
end
puts low_count