#include <iostream>
#include <string.h>

using namespace std;

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

    int arr[n + 1];
    memset(arr, -1, (n + 1) * sizeof(int));

    int ans = 0;

    for (int i = 0; i < 2 * n; i++)
    {
        int x;
        cin >> x;
        if (arr[x] == -1)
            arr[x] = i;
        else
            ans += i - arr[x];
    }

    cout << ans;

    return 0;
}