from bisect import *
def solve():
  ans = 0
  N = int(input())
  A = list(map(int, input().split()))
  B = list(map(int, input().split()))
  dic = {}
  for i in range(N):
    dic[B[i]] = i
  for i in range(N):
    A[i] = dic[A[i]]
  lis = [A[0]]
  for i in range(1,N):
    ind = bisect_right(lis,A[i])
    ans += i-ind
    insort_right(lis,A[i])
  return ans
print(solve())