## https://yukicoder.me/problems/no/1115

class BinaryIndexTree:
    """
    フェニック木(BinaryIndexTree)の基本的な機能を実装したクラス
    """
    def __init__(self, size):
        self.size = size
        self.array = [0] * (size + 1)
    
    def add(self, x, a):
        index = x
        while index <= self.size:
            self.array[index] += a
            index += index & (-index)
    
    def sum(self, x):
        index = x
        ans = 0
        while index > 0:
            ans += self.array[index]
            index -= index & (-index)
        return ans

    def least_upper_bound(self, value):
        if self.sum(self.size) < value:
            return -1
        elif value <= 0:
            return 0

        m = 1
        while m < self.size:
            m *= 2

        k = 0
        k_sum = 0
        while m > 0:
            k0 = k + m
            if k0 < self.size:
                if k_sum + self.array[k0] < value:
                    k_sum += self.array[k0]
                    k += m
            m //= 2
        if k < self.size:
            return k + 1
        else:
            return -1


def main():
    N = int(input())
    A = list(map(int, input().split()))
    B = list(map(int, input().split()))

    a_map = {A[i]: i for i in range(N)}
    array = [-1] * N
    for i in range(N):
        b = B[i]
        pos = a_map[b]
        array[pos] = i + 1
    
    bit = BinaryIndexTree(N)
    answer= 0
    for i in array:
        answer += bit.sum(bit.size) - bit.sum(i)
        bit.add(i, 1)
    print(answer)

 








if __name__ == "__main__":
    main()