using System;
using static System.Console;
using static System.Math;
using System.Numerics;
using System.Collections.Generic;
using System.Linq;


namespace AtCoder
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var n = int.Parse(ReadLine());
            //var s = Conasole.ReadLine().Split(' ')
            var a = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            var b = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            var list = new List<int>(a);

            var ans = 0;
            for (int i = 0; i < n; i++)
            {
                ans += list.IndexOf(b[i]);
                list.Remove(b[i]);
            }


            WriteLine(ans);
            Out.Flush();
        }




    }



}