#include <bits/stdc++.h>
using namespace std;
inline long long read() {
  char c = getchar();
  long long f = 1, x = 0;
  while (c < '0' || c > '9') {
    if (c == '-') f = -1;
    c = getchar();
  }
  while (c >= '0' && c <= '9') x = x * 10 + (c - '0'), c = getchar();
  return x * f;
}
void MOD(int &x) {
  if (x >= 1000000007) x -= 1000000007;
}
long long c[500010][3], a[500010];
int cnt[500010], pre[500010], pos[500010];
int Rand() { return rand() << 15 | rand(); }
long long RAND() { return 1ll * Rand() * Rand(); }
map<long long, int> mp;
int main() {
  srand(124);
  int n;
  n = read();
  for (int i = 1; i <= n; i++)
    c[i][0] = RAND(), c[i][1] = RAND(), c[i][2] = c[i][0] ^ c[i][1];
  int l = 0;
  long long ans = 0;
  mp[0]++;
  for (int i = 1; i <= n; i++) {
    int x;
    x = read();
    cnt[x]++;
    a[i] = a[i - 1] ^ c[x][cnt[x] % 3];
    pre[i] = pos[x];
    pos[x] = i;
    while (pre[pre[pre[i]]] > l) {
      mp[a[l]]--;
      l++;
    }
    if (mp.count(a[i])) ans += mp[a[i]];
    mp[a[i]]++;
  }
  printf("%lld\n", ans);
}
