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

ans = 0
len = 0

(N - 1).times do |i|
  a1, b1 = A[i], B[i]
  a2, b2 = A[i + 1], B[i + 1]
  min_b, max_b = [b1, b2].minmax

  if a1 + max_b < a2 + min_b
    len += 1
  else
    ans += len * (1 + len) / 2
    len = 0
  end
end

ans += len * (1 + len) / 2

puts ans