My attempt at a recursive coin change combo challenge

COINS=WIN

internal class Program
{
    private static readonly int[] _denominations = {1, 2, 5};

    private static void Main(string[] args)
    {
        const int total = 6;

        var result = GetCount(amount, 0);

        Console.WriteLine(result);
        Console.ReadLine();
    }

    public static int GetCount(int amount, int index)
    {
        if (amount == 0)
            return 1;
        if (amount < 0 || _denominations.Length == index)
            return 0;

        return GetCount(amount - _denominations[index], index) + GetCount(amount, index + 1);
    }
}