n = gets.to_s.to_i
a = Array.new(n) { gets.to_s.to_i }
b = Array.new(n) { gets.to_s.to_i }

temp = a.map { |val| {val, 0} }
ans = Int32::MAX

n.times do |i|
  s = temp.to_set
  ma = 0
  
  n.times do |j|
    element = s.first
    s.delete(element)
    
    t, u = element
    new_val = t + b[(i + j) % n] // 2
    s.add({new_val, u + 1})
    
    ma = Math.max(ma, u + 1)
  end
  
  ans = Math.min(ans, ma)
end

puts ans