import sys

sys.setrecursionlimit(10 ** 7)
rl = sys.stdin.readline


class BinaryIndexedTree:
    # 1-indexed
    def __init__(self, n):
        self.n = n
        self.data = [0] * (n + 1)
    
    def add(self, i, x):
        # Accessed by 0-indexed
        i += 1
        while i <= self.n:
            self.data[i] += x
            i += i & -i
    
    def sum(self, i):
        # [0, i)
        res = 0
        while i:
            res += self.data[i]
            i -= i & -i
        return res
    
    def bisect_left(self, w):
        if w <= 0:
            return 0
        i = 0
        k = 1 << (self.n.bit_length() - 1)
        while 0 < k:
            if i + k <= self.n and self.data[i + k] < w:
                w -= self.data[i + k]
                i += k
            k >>= 1
        return i + 1


def solve():
    n = int(rl())
    a = list(map(int, rl().split()))
    b = list(map(int, rl().split()))
    
    b_to_idx = {bi: i for i, bi in enumerate(b)}
    c = [b_to_idx[ai] for ai in a]
    
    bit = BinaryIndexedTree(n)
    ans = 0
    for i, ci in enumerate(c):
        bit.add(ci, 1)
        ans += i + 1 - bit.sum(ci + 1)
    print(ans)


if __name__ == '__main__':
    solve()