#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
using ll = long long;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define rep2(i,m,n) for (int i = (m); i < (n); ++i)
#define rep3(i,a,b) for (int i = (a); i >= (b); --i)
#define all(x) (x).begin(),(x).end()
inline int popcount(const int x) { return __builtin_popcount(x);}
inline ll popcount(const ll x) { return __builtin_popcountll(x);}
template<class T> void chmin(T &a, const T &b) noexcept { if (b < a) a = b;}
template<class T> void chmax(T &a, const T &b) noexcept { if (a < b) a = b;}
template<class T> void drop(const T &x) { std::cout<<x<<endl; exit(0);}
void debug_out() { std::cout << "\n";}
template<class T, class... Args> void debug_out(const T &x, const Args &... args) { std::cout<<x<< " "; debug_out(args...);}
#ifdef _DEBUG
  #define debug(...) debug_out(__VA_ARGS__)
#else
  #define debug(...) 
#endif

struct InitIO{
  InitIO() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << std::fixed << std::setprecision(15);
  }
}init_io;

template<typename T>
struct BIT {
  int n;
  vector<T> d;
  BIT(int n=0):n(n),d(n+1) {}
  void add(int i, T x=1) {
    assert(i < n);
    for (i++; i <= n; i += i&-i) { //LSB:i&(-i)
      d[i] += x;
    }
  }
  T sum(int i) {
    assert(i < n);
    T x = 0;
    for (i++; i; i -= i&-i) {
      x += d[i];
    }
    return x;
  }
  T sum(int l, int r) { //[l,r)
    assert(l < n);
    assert(r <= n);
    return sum(r-1) - sum(l-1);
  }
};

int main() {
  int n;
  cin >> n;
  vector<int> a_ind(n), b(n);
  rep(i,n) {
    int x; cin >> x; x--;
    a_ind[x] = i;
  }
  rep(i,n) {
    cin >> b[i];
    b[i]--;
  }
  BIT<ll> bit(n);
  ll ans = 0;
  rep3(i, n-1, 0) {
    ans += bit.sum(0, a_ind[b[i]]);
    bit.add(a_ind[b[i]]);
  }
  cout << ans << endl;
  return 0;
}