#include <bits/stdc++.h>
using namespace std;
long long a[100001];
long long b[100001];
int main() {
  ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) cin >> a[i];
  map<int, int> cnt;
  vector<int> q;
  int loc = 0;
  for (int i = n - 1; i >= 0; i--) {
    cnt[a[i]]++;
    if (cnt[a[i]] == 1) loc++;
    b[i] = loc;
  }
  cnt.clear();
  long long ans = 0;
  for (int i = 0; i < n - 1; i++) {
    cnt[a[i]]++;
    if (cnt[a[i]] == 1) ans += b[i + 1];
  }
  cout << ans << endl;
  return 0;
}
