using System;

public class Hello
{
    public static long c1, c2, c3;
    static void Main()
    {

        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        c1 = c2 = c3 = 0;
        for (int i = 0; i < n; i++)
        {
            if (a[i] == 1) c1++;
            else if (a[i] == 2) c2++;
            else c3++;
        }
        getAns();
    }
    static void getAns()
    {
        var a11 = c1 * (c1 - 1);
        var a22 = c2 * (c2 - 1) / 2;
        var a33 = c3 * (c3 - 1) / 2;
        var a12 = c1 * c2 * 3;
        var a13 = c1 * c3 * 2;
        var a23 = c2 * c3;
        Console.WriteLine(a11 + a22 + a33 + a12 + a13 + a23);
    }
}