using System;

public class Program

{

    public static void Main()

    {

        int[] towers = new int[] { 4, 2, 0, 0 , 2, 0 };

        Console.WriteLine("The towers look like " + String.Join(", ", towers));

        Console.WriteLine("Is hoppable? " + IsHoppable(towers));

        towers = new int[] { 1, 0 };

        Console.WriteLine("The towers look like " + String.Join(", ", towers));

        Console.WriteLine("Is hoppable? " + IsHoppable(towers));

    }

    private static bool IsHoppable(int[] towers, int fromIndex = 0)

    {

        if (fromIndex >= towers.Length)

        {

            return true;

        }

        int availableSteps = towers[fromIndex];

        if (availableSteps == 0)

        {

            return false;

        }

        for (int i = 1; i <= availableSteps; i++)

        {

            if (IsHoppable(towers, fromIndex + i))

            {

                return true;

            }

        }

        return false;

    }

}