#include <bits/stdc++.h>

#define pb push_back
#define mp make_pair
#define mt make_tuple
#define ll long long
#define pii pair<int,int>
#define tii tuple <int,int,int>
#define N 100005
#define mod 2000003
#define X first
#define Y second
#define eps 0.0000000001
#define all(x) x.begin(),x.end()
#define tot(x) x+1,x+n+1
using namespace std;
int sol,sau,i,k,n,p[50050],x;
set<int>v;

int main() {
   cin>>n;
   for(i=1;i<=n;i++)
    {
        cin>>x;
        p[x]=n-i+1;
    }
    for(i=1;i<=n;i++)
    {
        cin>>x;
        sol+=v.size()-distance(v.begin(),v.lower_bound(p[x]));
        v.insert(p[x]);;
    }
    cout<<sol;
    return 0;
}