#include <iostream>
#include <vector>

int main()
{
    int n;
    std::cin >> n;
    std::vector<int> a(n);

    for (size_t i = 0; i < n; i++)
    {
        std::cin >> a[i];
    }

    long long one, two, more;
    one = 0;
    two = 0;

    for (auto ai : a)
    {
        if (ai == 1)
        {
            one++;
        }
        else if (ai == 2)
        {
            two++;
        }
    }

    more = n - one - two;

    long long result = 0;

    result += (two + more) * (two + more - 1) / 2;
    result += 2 * (one + more) * (one + more - 1) / 2;
    result += 3 * one * two;
    std::cout << result << std::endl;
}