#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
#include <stack>
#include <algorithm>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <tuple>
#include <assert.h>
#include <deque>
#include <bitset>
#include <iomanip>
#include <limits>
#include <chrono>
#include <random>
#include <array>
#include <unordered_map>
#include <functional>
#include <complex>
#include <numeric>
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
//constexpr long long MAX = 5100000;
constexpr long long INF = 1LL << 60;
constexpr int inf = 1000000007;
//constexpr long long mod = 1000000007LL;
constexpr long long mod = 998244353LL;
const long double PI = acos((long double)(-1));

using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;


template<typename T>
struct BIT {
	int n;
	vector<T> bit;
	BIT() :n(0) {}
	BIT(int _n) :n(_n) { bit = vector<T>(n + 1); }
	void add1(int idx, T val) {
		for (int i = idx; i <= n; i += i & -i) bit[i] += val;
	}
	T sum1(int idx) {
		T res = 0;
		for (int i = idx; i > 0; i -= i & -i) res += bit[i];
		return res;
	}
	//0-indexed
	void add(int idx, T val) { add1(idx + 1, val); }
	//0-indexed [left, right)
	T sum(int left, int right) { return sum1(right) - sum1(left); }

	int lower_bound(T x) {
		int res = 0;
		int k = 1;
		while (2 * k <= n) k <<= 1;
		for (; k > 0; k >>= 1) {
			if (res + k <= n and bit[res + k] < x) {
				x -= bit[res + k];
				res += k;
			}
		}
		return res;
	}
};
int main()
{
    /*
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    */

	int n; scanf("%d", &n);
	vector<int> a(n); for (int i = 0; i < n; i++) scanf("%d", &a[i]), a[i]--;
	vector<int> b(n); for (int i = 0; i < n; i++) scanf("%d", &b[i]), b[i]--;
	vector<int> cnv(n); for (int i = 0; i < n; i++) cnv[b[i]] = i;
	for (int i = 0; i < n; i++) a[i] = cnv[a[i]];
	BIT<ll> bit(n);
	ll res = 0;
	for (int i = 0; i < n; i++) {
		res += bit.sum(a[i], n);
		bit.add(a[i], 1);
	}
	cout << res << endl;
    return 0;
}