using System;

public class BIT
{
    private int[] data;
    private int n;
    public BIT(int n)
    {
        this.n = n;
        data = new int[n + 1];
    }
    public int getSum(int i)
    {
        var s = 0;
        while (i > 0)
        {
            s += data[i];
            i -= i & -i;
        }
        return s;
    }
    public void addix(int i, int x)
    {
        while (i <= n)
        {
            data[i] += x;
            i += i & -i;
        }
    }
}


public class hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        line = Console.ReadLine().Trim().Split(' ');
        var b = Array.ConvertAll(line, int.Parse);
        getAns(n, a, b);
    }
    static void getAns(int n, int[] a, int[] b)
    {
        var rb = new int[n + 1];
        for (int i = 0; i < n; i++) rb[b[i]] = i + 1;
        var c = new int[n];
        for (int i = 0; i < n; i++) c[i] = rb[a[i]];
        getINV(n, c);
    }
    static void getINV(int n, int[] a)
    {
        var bit = new BIT(n);
        var ans = 0L;
        bit.addix(a[0], 1);
        for (int i = 1; i < n; i++)
        {
            bit.addix(a[i], 1);
            ans += i + 1 - bit.getSum(a[i]);
        }
        Console.WriteLine(ans);
    }
}