internal class Program
{
    private static void Main(string[] args)
    {
        //Variables
        const double Pi = 3.142;
        double Radius;
        double Height;
        double VolumeOfCone;

        //User input for radius of the cone
        Console.WriteLine("Enter the chosen radius of your cone (1-30) :)");
        Radius = Convert.ToDouble(Console.ReadLine());

        //Presence check
        do
        {
            if (Radius < 1)
            {
                Console.WriteLine("Error! Please enter a value 1-30");
                Console.WriteLine(" ");
                Radius = Convert.ToDouble(Console.ReadLine());
            }
        } 
        while (Radius < 1);
        //Validation Check
        do
        {
            if (Radius > 30)
            {
                Console.WriteLine("Error! Please enter a value below 30!");
                Console.WriteLine(" ");
                Radius = Convert.ToDouble(Console.ReadLine());
            }
        }
        while (Radius > 30);


        //User input for height of the cone
        Console.WriteLine("Enter the chosen height of your cone (1-30) :)");
        Height = Convert.ToDouble(Console.ReadLine());

        //Presence check
        do
        {
            if (Height < 1)
            {
                Console.WriteLine("Error! Please enter a value 1-30");
                Console.WriteLine(" ");
                Height = Convert.ToDouble(Console.ReadLine());
            }
        }
        while (Height < 1);

        //Validation
        do
        {
            if (Height > 30)
            {
                Console.WriteLine("Error! Please enter a value below 30!");
                Console.WriteLine(" ");
                Height = Convert.ToDouble(Console.ReadLine());
            }
        }
        while (Height > 30);


        VolumeOfCone = Pi * (Radius * Radius) * (Height / 3);

        Console.WriteLine("The Volume of your cone is: " + VolumeOfCone);
        Console.WriteLine(" ");
        Console.WriteLine("Please press enter to exit");

        Console.ReadLine();

    }
}