#include <bits/stdc++.h>

/**
 * @title Inversion number
 * @docs inversion_number.md
 */
namespace inversion_number{
  template <typename T, typename Compare>
  int64_t rec(std::vector<T> &a, const Compare &compare){
    int n = a.size();
    if(n <= 1) return 0;
    
    int64_t ret = 0;
    
    std::vector<T> b(a.begin(), a.begin() + n/2);
    std::vector<T> c(a.begin() + n/2, a.end());
    
    ret += rec(b, compare);
    ret += rec(c, compare);
    
    int ai = 0, bi = 0, ci = 0;
    
    while(ai < n){
      if(bi < (int)b.size() and (ci == (int)c.size() or not compare(b[bi], c[ci]))){
        a[ai] = b[bi];
        ++bi;
      }else{
        ret += n/2 - bi;
        a[ai] = c[ci];
        ++ci;
      }
      ++ai;
    }
    
    return ret;
  }
  
  template <typename T, typename Compare>
  int64_t solve(std::vector<T> a, const Compare &compare){
    return rec(a, compare);
  }
}



int main(){
  int N;
  while(std::cin >> N){
    std::vector<int> A(N), B(N);
    for(int i = 0; i < N; ++i) std::cin >> A[i], A[i] -= 1;
    for(int i = 0; i < N; ++i) std::cin >> B[i], B[i] -= 1;

    std::map<int, int> m;
    for(int i = 0; i < N; ++i) m[B[i]] = i;
    
    for(int i = 0; i < N; ++i) A[i] = m[A[i]];

    auto ans = inversion_number::solve(A, std::greater<>());

    std::cout << ans << "\n";
  }
  
  return 0;
}