import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

class SegmentTree(object):
	#N:処理する区間の長さ
	def __init__(self, N):
		self.N = N
		self.N0 = 2 ** (N - 1).bit_length()
		self.initVal = 0
		self.data = [self.initVal] * (2 * self.N0)

	# 区間クエリの種類
	def calc(self, a, b):
		return a + b

	# k番目の値にxを加算
	def add(self, k, x):
		k += self.N0 - 1
		self.data[k] += x
		while k > 0:
			k = (k - 1) // 2
			self.data[k] = self.calc(self.data[2 * k + 1], self.data[2 * k + 2])

	#区間[l, r]の演算値
	def query(self, l, r):
		L = l + self.N0; R = r + self.N0 + 1
		m = self.initVal
		while L < R:
			if R & 1:
				R -= 1
				m = self.calc(m, self.data[R - 1])
			if L & 1:
				m = self.calc(m, self.data[L - 1])
				L += 1
			L >>= 1; R >>= 1

		return m

#処理内容
def main():
	N = int(input())
	A = getlist()
	B = getlist()
	D = defaultdict(int)
	for i in range(N):
		D[A[i]] = i

	C = [D[B[i]] for i in range(N)]
	# print(C)

	Seg = SegmentTree(N)
	ans = 0
	for i in range(N):
		Seg.add(C[i], 1)
		ans += i + 1 - Seg.query(0, C[i])

	print(ans)

if __name__ == '__main__':
	main()