#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n;
    cin >> n;

    vector<int> hash(100001, -1);
    long long sum = 0;

    for (int i = 0; i < 2 * n; ++i) {
        int x;
        cin >> x;

        if (hash[x] == -1)
            hash[x] = i;
        else {
            hash[x] = abs(i - hash[x]);
            sum += hash[x];
        }
    }

    cout << sum;
}