#include <iostream>
#include <vector>
using namespace std;

int main() 
{
    int n;
    cin >> n;

    vector<int> houses(2 * n);
    for (int i = 0; i < 2 * n; i++) 
	{
        cin >> houses[i];
    }

    vector<int> house(n + 1, -1); 
    long long totalLength = 0;

    for (int i = 0; i < 2 * n; i++) 
	{
        int houseNumber = houses[i];
        
        if (house[houseNumber] != -1) 
		{
            totalLength += i - house[houseNumber];
        }
        
        house[houseNumber] = i;
    }

    cout << totalLength << endl;

    return 0;
}