using System;

public class Program

{

    public static void Main()

    {

        // 1. 

        int i;

        long product = 1;

        for (i=1; i<=10; i++)

        {

            product *= i;

        }

        Console.WriteLine("The product is {0}", product); 

        product = 1;

        for (i=1; i<=20; i++)

        {

            product *= i;

        }

        Console.WriteLine("The product is {0}", product); 

        while (i <= 10) 

        {

        product *= i;

        i++;

        }

        Console.WriteLine("The product is {0}", product);

        while (i <= 17) 

        {

        product *= i;

        i++;

        }

        Console.WriteLine("The product is {0}" , product); 

​

        //2. for Gauss question, start at m instead of 1

        int m;

        long sum = 1777;

        for (m = 1777; m <= 2022; m++)  

        {

        sum += m;

        }

        Console.WriteLine("The sum is {0}" , sum);

    }

}