#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() { 
  ios::sync_with_stdio(false); cin.tie(0);
  int n;
  cin >> n;
  vector<int> a(n);
  for (auto& x : a) cin >> x;
  vector<int> cnt1(n + 1), cnt2(n + 1);
  for (int i = 0; i < n; i++) {
    cnt1[i + 1] = cnt1[i] + (a[i] == 1);
    cnt2[i + 1] = cnt2[i] + (a[i] == 2);
  }
  long long ans = 0;
  for (int i = 0; i < n; i++) {
    if (a[i] == 1) {
      ans += 2 * cnt1[i];
      ans += 3 * cnt2[i];
      ans += 2 * (i - cnt1[i] - cnt2[i]);
    } else if (a[i] == 2) {
      ans += 3 * cnt1[i];
      ans += 1 * cnt2[i];
      ans += 1 * (i - cnt1[i] - cnt2[i]);
    } else {
      ans += 2 * cnt1[i];
      ans += 1 * cnt2[i];
      ans += 1 * (i - cnt1[i] - cnt2[i]);
    }
  }
  cout << ans << endl;  
  return 0;
}