using System;

public class Program

{

    public static void Main()

    {

    int ten=1;

    int fifty =1;

    int hundred=1;

    int thousand =1;

    int product =1;

        do 

        {

            product = product * ten; 

            ten++;

        } while (ten < 10);

        Console.WriteLine("the product of the first 10 numbers is:" + product);

        for (int twenty =1; twenty < 20 ; twenty++)

             {

                product = twenty * product;

                 Console.WriteLine("The current index for the product of twenty is:" + product);

            }

        while (fifty < 50)

        {

            product = product * fifty;

            fifty++;

            Console.WriteLine(product);

        }

        while (hundred < 100)

        {

            product = product * hundred;

            hundred++;

            Console.WriteLine(product);

        }

        while (thousand < 1000)

        {

            product = product * thousand;

            thousand++;

            Console.WriteLine(product);

        }

    }

}