#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <cstring>
#include <map>
#include <set>
#include <iomanip>
#include <cstdio>
#define mp make_pair
#define pb push_back
#define LL long long
#define inf 2e9
#define zeros(x) x^(x-1)&x
#define Nmax 100001
using namespace std;


int n,x,AIB[Nmax+10];
LL nr;
int uz[Nmax+10];
void add(int poz,int val)
{
    for (int i=poz;i<=Nmax;i+=zeros(i))
        AIB[i] += val;
}
int sum(int poz)
{
    int rez = 0;
    for (int i=poz;i>=1;i-=zeros(i))
        rez += AIB[i];
    return rez;
}
int main()
{
    cin>>n;
    for (int i=1;i<=2*n;i++)
    {
        cin>>x;
        if (uz[x]==0)
        {
            uz[x] = i;
            add(i,1);
        }
        else
        {
            nr= 1LL * nr + sum(i) - sum(uz[x]);
            add(uz[x],-1);
        }
    }
        cout<<nr;

    return 0;
}