#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;


//1-indexedに注意！！！
struct BIT{
    private:
    int n,n_;
    vector<long long> bit;

    public:
    BIT(int n):n(n){
        bit.resize(n+1);
        n_ = 1;
        while(n_<=n) n_<<=1;
        n_ >>= 1;
    }
    //1-index
    long long sum(int i){
        long long res = 0;
        while(i > 0){
            res += bit[i];
            i -= i&-i;
        }
        return res;
    }
    //1-index
    void add(int i,long long val){
        while(i <= n){
            bit[i] += val;
            i += i&-i;
        }
    }
    //return 1-index
    int lowerbound(long long w){
        if(w <= 0) return 0;
        int x = 0;
        for(int k=n_;k>0;k>>=1){
            if(x+k<=n&&bit[x+k]<w){
                w -= bit[x+k];
                x += k;
            }
        }
        return x+1;
    }
};



int main(){
        int n;
        cin >> n;
        vector<int> a(n),b(n);
        rep(i,n) cin >> a[i];
        rep(i,n) cin >> b[i];
        map<int,int> mp;
        rep(i,n) mp[b[i]] = i;
        vector<int> v(n);
        rep(i,n){
            v[i] = mp[a[i]];
        }
        BIT bit(n);
        ll ans = 0;
        rep(i,n){
                ans += i-bit.sum(v[i]+1);
                bit.add(v[i]+1,1);
        }
        cout << ans << endl;
        return 0;
}