using System;

​

public class Program

{

    public static void Main()

    //Write a C# Sharp program to find the product of 10 natural numbers starting from 20.

    //Expected Output : The product is : 1168737792

    {

        int i;

        int product=1;

        for (i = 20; i <30;i++ )

        {

            product = product * i;   

        }

        Console.WriteLine(product);

    }

}