using System;

public class Program

{

    public static void Main()

    {

        var qty = "9.8";

        if (qty.Contains("."))

        {

            bool validDecimal = decimal.TryParse(qty, out decimal qtyAsDecimal);

            if (!validDecimal)

            {

                Console.WriteLine("THROW: invalid decimal");

            } 

            else 

            {

                var quantity = (int)decimal.Truncate(qtyAsDecimal);

                Console.WriteLine(quantity);

            }

        }

        else

        {

            bool isValidQuantity = int.TryParse(qty, out int quantity);

            if (!isValidQuantity)

            {

                Console.WriteLine("THROW: invalid quantity");

            } else

            {

            Console.WriteLine(quantity);

            }

        }

    }

}