#include <iostream>
using namespace std;
int main()
{
    int n;   cin >> n;
    int arr1[2*n] , arr2[2*n];
    for ( int i = 0 ; i < 2*n ; i ++ )
    {
        cin >> arr1[i];
        arr2[i] = i;
    }

    int metr = 0;
    for ( int i = 0 ; i < 2*n ; i ++ )
    {
        for ( int j = 0 ; j < 2*n ; j ++ )
        {
            if ( arr1[i] > arr1[j] && i < j )
            {
                swap ( arr1[i] , arr1[j] );
                swap ( arr2[i] , arr2[j] );
            }
        }

        if ( i % 2 == 1 && i > 0 )
        {
            metr += abs ( arr2[i] - arr2[i - 1] );
        }
    }

    cout << metr;

    return 0;
}