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

using namespace std;
int n,i,j,A1[50001],V[100001],S[100001],sol;
bool VIZ[50001];
int abs(int x)
{
    return max(x,-x);
}
int main()
{

    cin>>n;
    for(i=1;i<=2*n;i++)
    {
        cin>>V[i];
        if(VIZ[V[i]]==0)
        {
            A1[V[i]] = i;
            VIZ[V[i]] = 1;
        }

    }
    memset(VIZ,0,sizeof VIZ);
    for(i=1;i<=2*n;i++)
    {
        if(VIZ[V[i]] == 0)
        {
            S[i] = S[i-1]+1;
            VIZ[V[i]] = 1;
        }
        else
        {
            S[i] = S[i-1]-1;
            sol+=abs(S[i-1]-S[A1[V[i]]]);
        }
    }
    cout<<sol/2;
    return 0;
}