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

//template
#define rep(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define ALL(v) (v).begin(),(v).end()
typedef long long int ll;
const int inf = 0x3fffffff; const ll INF = 0x1fffffffffffffff; const double eps=1e-12;
template<typename T>inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<typename T>inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
//end

int bit[200010]={},n;
void add(int i,int x){
  while(i<=n){
    bit[i]+=x;
    i+=(i&(-i));
  }
}
ll sum(int i){
  ll s=0;
  while(i){
    s+=bit[i];
    i-=(i&(-i));
  }
  return s;
}
 
int main(){
  scanf("%d",&n);
  vector<int> a(n),b(n);
  rep(i,0,n)scanf("%d",&a[i]);
  rep(i,0,n)scanf("%d",&b[i]);
  map<int,int> pos;
  rep(i,0,n)pos[b[i]]=i+1;
  rep(i,0,n)a[i]=pos[a[i]];
  ll ans=0;
  rep(i,0,n){
    ans+=i-sum(a[i]);
    add(a[i],1);
  }
  printf("%lld\n",ans);
  return 0;
}