#include <bits/stdc++.h>
using namespace std;

int n;
vector<long long> cnt(4, 0);

long long solve();

int main() {
  cin >> n;
  for (int i = 0; i < n; ++i) {
    int a;
    cin >> a;
    if (a <= 2)
      ++cnt[a];
    else
      ++cnt[3];
  }
  cout << solve() << endl;
  return 0;
}

long long solve() {
  long long res = 0;
  auto mex = [](int l, int r) {
    if (l > r) swap(l, r);
    if (l != 1) return 1;
    if (r == 2) return 3;
    return 2;
  };
  for (int i = 1; i <= 3; ++i)
    for (int j = i; j <= 3; ++j) {
      long long now = cnt[i] * cnt[j];
      if (i == j) now = cnt[i] * (cnt[i] - 1) / 2;
      res += now * mex(i, j);
    }
  return res;
}