#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;

template <typename T>
class BIT
{
private:
	T n;
	vector<T> data;

public:
	BIT(T n) : n(n), data(n + 1, 0)
	{
	}

	void add(int i, T x)
	{
		if (i == 0)
			return;
		for (int j = i; j <= n; j += (j & -j))
			data[j] += x;
	}

	T sum(int i)
	{
		T s{ 0 };
		for (int j = i; j > 0; j -= (j & -j))
			s += data[j];

		return s;
	}
};

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	ll n;
	cin >> n;

	vector<int> a(n), b(n);
	for (auto&& ia : a)
	{
		cin >> ia;
		--ia;
	}

	for (int i = 0; i < n; ++i)
	{
		int bb;
		cin >> bb;
		b[--bb] = i;
	}

	for (int i = 0; i < n; i++)
		a[i] = b[a[i]] + 1;

	ll res{ 0 };
	BIT<ll> bt(n);
	for (int i = 0; i < n; ++i)
	{
		res += i - bt.sum(a[i]);
		bt.add(a[i], 1);
	}

	cout << res << "\n";

	return 0;
}