#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
const ll MOD = 1000000007;
const ll INF = 1e18;
#define REP(i, n) for (int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()

int main(){
	int n; cin >> n;
	VI a(n), p(n+1);
	REP(i,n) cin >> a[i];
	int b;
	REP(i,n){
		cin >> b;
		p[b]=i;
	}
	REP(i,n) a[i]=p[a[i]];
	ll ans=0; VI c;
	REP(i,n){
		auto itr=lower_bound(ALL(c),a[i]);
		ans+=c.size()-(itr-c.begin());
		c.insert(itr,a[i]);
	}
	cout << ans << endl;
	return 0;
}