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

bit = [0] * (n + 4)


def add(a, i):
    while i <= n:
        bit[i] += a
        i += i & -i


def query(i):
    res = 0
    while i > 0:
        res += bit[i]
        i -= i & -i
    return res


t = [0] * (n + 1)
for i in range(n):
    t[b[i]] = i + 1
ans = 0
for i in range(n):
    p = t[a[i]]
    ans += i - query(p)
    add(1, p)
print(ans)