#include <iostream>
#define NMAX 50005

using namespace std;

int n, v[NMAX], st[NMAX], cnt = 0, last[NMAX];
long long ans = 0;
bool used[NMAX];

int main()
{
    cin >> n;

    n *= 2;

    for (int i = 1; i <= n; ++ i)
        cin >> v[i];

    for (int i = 1; i <= n; ++ i)
    {
        if (last[v[i]] == 0)
        {
            last[v[i]] = i;
            continue;
        }

        ans += 1LL * min(i - last[v[i]] - 1, n - i + last[v[i]] - 1);
       // cout << i << " " << ans << " " << last[v[i]] << '\n';
    }

    cout << ans / 2;
    return 0;
}