#region Header
#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
import bisect
import heapq

def input():
    return sys.stdin.readline()[:-1]

sys.setrecursionlimit(1000000)
#endregion

# _INPUT = """# paste here...
# """
# sys.stdin = io.StringIO(_INPUT)

# 最もシンプル
class BIT:
    """
    Binary Indexed Tree (Fenwick Tree), 1-indexed
    """

    def __init__(self, n):
        """
        Parameters
        ----------
        n : int
            要素数。index は 0..n になる。
        """
        self.size = n
        self.data = [0] * (n+1)
        # self.depth = n.bit_length()

    def add(self, i, x):
        while i <= self.size:
            self.data[i] += x
            i += i & -i

    def get_sum(self, i):
        s = 0
        while i > 0:
            s += self.data[i]
            i -= i & -i
        return s

    def get_rsum(self, l, r):
        """
        [l, r) の sum
        """
        return self.get_sum(r) - self.get_sum(l-1)


def main():
    N = int(input())
    A = list(map(int, input().split()))
    B = list(map(int, input().split()))
    D = dict()
    for i in range(N):
        D[B[i]] = i
    A1 = [D[A[i]] for i in range(N)]

    bit = BIT(N)
    v = 0
    for a in reversed(A1):
        v += bit.get_sum(a+1)
        bit.add(a+1, 1)
    print(v)

if __name__ == '__main__':
    main()