#include <bits/stdc++.h>
using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<double, double> pdd;
typedef vector<ll> vl;
typedef vector<vector<ll>> vvl;
//typedef vector<vector<ll>> Graph;

const ll mod = 1e9 + 7;
//const ll mod = 998244353;

#define REP(i,n) for(ll i=0;i<(ll)n;i++)
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define spa << " " <<
#define fi first
#define se second

template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }

template<class S, class T> ostream& operator << (ostream& os, const pair<S, T> v){
os << "(" << v.first << ", " << v.second << ")"; return os;
}
template<class T> ostream& operator << (ostream& os, const vector<T> v){
for(int i = 0; i < (int)v.size(); i++){if(i > 0){os << " ";} os << v[i];} return os;
}
template<class T> ostream& operator << (ostream& os, const vector<vector<T>> v){
for(int i = 0; i < (int)v.size(); i++){if(i > 0){os << endl;} os << v[i];} return os;
}

template<typename T> void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++)
{cerr<<v[i][0];for(ll j=1;j<w;j++)cerr spa v[i][j];cerr<<endl;}};
template<typename T> void debug(vector<T>&v,ll n){if(n!=0)cerr<<v[0];
for(ll i=1;i<n;i++)cerr spa v[i];
cerr<<endl;};

template<class V, int ME> class BIT {
public:
    V bit[1<<ME];
    V total(int e) {V s=0;e++;while(e) s+=bit[e-1],e-=e&-e; return s;}
    void update(int e, V val) {e++; while(e<=1<<ME) bit[e-1]+=val,e+=e&-e;}
};
BIT<int, 18> bi;
ll count_inversion(vector<ll> &a, int s, int t){
    ////!!!!!!!! BIT をでかく取りすぎるとTLE するので適切に長さを変える！！ !!!!!!!!!////////
    // [s, t]（閉区間）の転倒数を求める
    REP(i, 1<<18) bi.bit[i] = 0;
    ll res = 0;
    for(int i=t;i>s-1;i--){
        res+=bi.total(a[i]);
        bi.update(a[i], 1);
    }
    return res;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    ll n;
    cin >> n;
    vector<ll> a(n), b(n), c(n);
    map<ll, ll> mp;
    REP(i, n) cin >> a[i];
    REP(i, n) cin >> b[i];

    REP(i, n) mp[a[i]] = i+1;
    REP(i, n) c[i] = mp[b[i]];

    ll res = count_inversion(c, 0, n-1);

    cout << res << endl;

    return 0;
}