import sys
input = sys.stdin.readline
from collections import *

class BIT:
    def __init__(self, n):
        self.n = n
        self.bit = [0]*(n+1)
    
    def add(self, i, x):
        i += 1
        
        while i<=self.n:
            self.bit[i] += x
            i += i&(-i)
            
    def acc(self, i):
        s = 0
        
        while i>0:
            s += self.bit[i]
            i -= i&(-i)
        
        return s

n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
d = defaultdict(int)

for i in range(n):
    d[b[i]] = i

bit = BIT(n)
ans = 0

for i in range(n):
    ans += i-bit.acc(d[a[i]])
    bit.add(d[a[i]], 1)

print(ans)