#include "bits/stdc++.h"

using namespace std;
using ll = long long;

void Main() {
    ll N;
    cin >> N;
    vector<ll> A(N, 0);
    for (ll i = 0; i < N; ++i) {
        cin >> A[i];
    }

    vector<ll> cnt1(N + 1, 0), cnt2(N + 1, 0);
    cnt1[0] = 0;
    cnt2[0] = 0;
    for (ll i = 1; i < N + 1; ++i) {
        cnt1[i] = cnt1[i - 1] + (A[i - 1] == 1 ? 1 : 0);
        cnt2[i] = cnt2[i - 1] + (A[i - 1] == 2 ? 1 : 0);
    }
    vector<ll> num1From(N, 0), num2From(N, 0);
    for (ll i = 0; i < N; ++i) {
        num1From[i] = cnt1.back() - cnt1[i];
        num2From[i] = cnt2.back() - cnt2[i];
    }
    ll ans = 0LL;
    for (ll i = 0; i < N - 1; ++i) {
        if (A[i] == 1) {
            ll n = num2From[i + 1];
            ans += n * 3;
            ans += (N - i - 1 - n) * 2;
        }
        else if (A[i] == 2) {
            ll n = num1From[i + 1];
            ans += n * 3;
            ans += (N - i - 1 - n) * 1;
        }
        else {
            ll n = num1From[i + 1];
            ans += n * 2;
            ans += (N - i - 1 - n) * 1;
        }
    }
    cout << ans << endl;
}

int main() {
    std::cout << std::fixed << std::setprecision(15);
    Main();
    return 0;
}