class BinaryIndexedTree:
    def __init__(self, size):
        self._data = [0] * size

    def add(self, i, x):
        data = self._data
        i += 1
        n = len(data)
        while i <= n:
            data[i - 1] += x
            i += i & -i

    def _sum(self, stop):
        data = self._data
        result = 0
        i = stop
        while i > 0:
            result += data[i - 1]
            i -= i & -i
        return result

    def range_sum(self, start, stop):
        return self._sum(stop) - self._sum(start)


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

d = {}
for i in range(n):
    d[a[i] - 1] = i
for i in range(n):
    b[i] = d[b[i] - 1]

bit = BinaryIndexedTree(n + 1)

result = 0
for x in b:
    result += bit.range_sum(x + 1, n + 1)
    bit.add(x, 1)
print(result)