using System;

public class Program

{

    public static void Main()

    {

        //1. Create a console application that uses a (1) while and (2) a for loop to calculate the product of the first 10 and 20 integer numbers.

            //Start at 1.

            //You will write 2 while and 2 for loop statements.

            int i;

            long product = 1;

            int numbers = 20;

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

            {

                product *= i;   

            }

            Console.WriteLine("The product of the first {0} numbers is: {1}", 10, product);

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

            {

                product *= i;   

            }

            Console.WriteLine("The product of the first {0} numbers is: {1}", numbers, product);

            int a;

            long sum =1777;

            for( a = 1777 ; a <= 1777 && a <= 2022 ; a++)

            {

                sum += a;

            }

            Console.WriteLine("The sum of the numbers between 1777 and 2022 with them included is: " + sum);

        //2. For the Gauss in you: Given m=1777 and n=2022, what is the sum of the numbers between m and n (both included in the sum)?

            //Add this for loop to your program above.

            //As a brain teaser (not required to solve), see slide #12 to find inspiration to derive a formula for this problem.

    }

}