#include <bits/stdc++.h>
using namespace std;
const long long N = 1000006;
long long n, a[N], f[N], h[N], x, y, ans;
map<long long, int> m;
vector<long long> v[N];
int main() {
  ios_base::sync_with_stdio(false), cin.tie(0);
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    f[i] = ((long long)rand() << 32) + (rand() << 16) + rand();
  }
  m[0]++;
  for (int i = 1; i <= n; i++) {
    v[a[i]].push_back(i);
    if (v[a[i]].size() > 3) y = v[a[i]][(int)v[a[i]].size() - 4];
    while (x < y) {
      m[h[x]]--;
      x++;
    }
    h[i] = h[i - 1] + f[a[i]];
    if (v[a[i]].size() % 3 == 0) {
      h[i] -= f[a[i]] * 3;
    }
    ans += m[h[i]]++;
  }
  cout << ans;
}
