#include <bits/stdc++.h>
using namespace std;
int n,i,j,a[100100],w[100100],s[100100];
long long r;
int sum(int x) {
  int r=0;
  for (; x>0; x&=x-1) r+=s[x];
  return r;
}
int main() {
  scanf("%d",&n); n*=2;
  for (i=1; i<=n; i++) {
    scanf("%d",&a[i]);
    if (w[a[i]]==0) {
      w[a[i]]=i;
      for (j=i; j<=n; j=(j<<1)-(j&(j-1))) s[j]++;
    } else {
      r+=sum(i)-sum(w[a[i]]);
      for (j=w[a[i]]; j<=n; j=(j<<1)-(j&(j-1))) s[j]--;
    }
  }
  printf("%lld\n",r);
  return 0;
}