#include <iostream>
using namespace std;
int main()
{
    int n;    cin >> n;
    int arr[2*n];
    for ( int i = 0 ; i < n*2 ; i ++ )
    {
        cin >> arr[i];
    }

    int i = 0;
    int j = 0;
    int metr = 0;
    while ( i < 2*n )
    {
        for ( int j = 1 ; j < 2*n ; j ++ )
        {
            if ( arr[i] == arr[j] && j > i )
            {
                metr += abs(i - j);
            }
        }

        i ++;
    }

    cout << metr;

    return 0;
}