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

struct iofast_t {
    iofast_t() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr); cout.tie(nullptr);
    }
} iofast;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

template <typename T, typename Compare = less<T>>
T &chmin(T &l, T r, Compare &&f = less<T>()) { return l = min(l, r, f); }
template <typename T, typename Compare = less<T>>
T &chmax(T &l, T r, Compare &&f = less<T>()) { return l = max(l, r, f); }

int main() {
    int n; cin >> n;
    auto a = vec<int>(uns, n);
    for (auto &e : a) cin >> e;

    int64_t ans = 0;

    int count1 = 0, count2 = 0, count3 = 0;
    for (auto v : a) {
        if (v != 1 && v != 2) {
            ans += count1 * 2;
            ans += count2 + count3;
        }

        if (v == 1) {
            ans += (count1 + count3) * 2;
            ans += count2 * 3;
        }

        if (v == 2) {
            ans += count1 * 3;
            ans += count2 + count3;
        }

        count1 += v == 1;
        count2 += v == 2;
        count3 += v != 1 && v != 2;
    }

    cout << ans << endl;
}