using System;

​

namespace pascal

{

    public class triangle

    {

        public static void Main(string[] args)

        {

            int row;

            int number = 1;

            int next = number;

            Console.Write("Enter a number: ");

            row = Int32.Parse(Console.ReadLine());

            if(row < 0)

            {

                Console.WriteLine("Number Less than Zero is not Allowed.");

            }

            else if(row > 25)

            {

                Console.WriteLine("Number Greater than 25 is not Allowed.");

            }

            else

            {

                for(int k=0; k<=row; k++)

                {

                    number = number * (row-k) / (k+1);

                    next = next + next;

                } 

                int previous = next / 2-1;

                Console.WriteLine("Sum of all numbers above row " + String.Format("{0}", row) + " is " + String.Format("{0}", previous + "." + ("Sum of numbers in row " + String.Format("{0}", row) + " is " + String.Format("{0}", next + ".")))); 

                row = row + 1;

                //Console.WriteLine("Sum of numbers in row " + String.Format("{0}", row) + " is " + String.Format("{0}", next));

            }

        Console.ReadLine();

        }

    }

}