#include <bits/stdc++.h>
using namespace std;
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;
}
void debug() { cerr << "\n"; }
template <class T> void debug(const T &x) { cerr << x << "\n"; }
template <class T, class... Args> void debug(const T &x, const Args &... args) {
    cerr << x << " ";
    debug(args...);
}
template <class T> void debugVector(const vector<T> &v) {
    for(const T &x : v) {
        cerr << x << " ";
    }
    cerr << "\n";
}
using ll = long long;

#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
const double EPS = 1e-7;
const int INF = 1 << 30;
const ll LLINF = 1LL << 60;
const double PI = acos(-1);
constexpr int MOD = 1000000007;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

//-------------------------------------

struct BIT // 0-indexed
{
    ll n;
    vector<ll> bit;
    // 初期化
    void init(ll n_input) {
        n = n_input + 1;
        bit.resize(n + 1, 0);
    }
    // v[0] + ... + v[k-1]
    ll sum(ll k) {
        ll res = 0;
        for(ll i = k - 1; i >= 0; i = (i & (i + 1)) - 1) {
            res += bit[i];
        }
        return res;
    }
    // v[i] + ... + v[j]
    ll sum_between(ll i, ll j) { return i <= j ? sum(j + 1) - sum(i) : 0; }
    // v[k] += x
    void add(ll k, ll x) {
        for(ll i = k; i < n; i |= i + 1) {
            bit[i] += x;
        }
    }
};

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    vector<int> a(n), b(n), A(n), B(n);
    map<int, int> f;
    for(int i = 0; i < n; i++) {
        cin >> a[i];
        f[a[i]] = i + 1;
        A[i] = i + 1;
    }
    for(int i = 0; i < n; i++) {
        cin >> b[i];
        B[i] = f[b[i]];
    }
    BIT bit;
    bit.init(n);
    ll ans = 0;
    for(int i = 0; i < n; i++) {
        ans += i - bit.sum(B[i] - 1);
        bit.add(B[i] - 1, 1);
    }
    cout << ans << endl;
}