n = int(input())
BIT = [0] * (n + 1)
def add(i, x):
    while i <= n:
        BIT[i] += x
        i += i & -i
def query(i):
    s = 0
    while i > 0:
        s += BIT[i]
        i -= i & -i
    return s
a = list(map(int, input().split()))
b = list(map(int, input().split()))
dic = {b[i]: i + 1 for i in range(n)}
lis = [dic[i] for i in a]
ans = 0
for i in range(n):
    ans += i - query(lis[i])
    add(lis[i], 1)
print(ans)