using System;

public class Program

{

    public static void Main()

    {

            string input;

            int inputNumber;

            int aboveRowSum = 0;

            int nextRowSum = 1;

            int counter = 1;

​

            Console.WriteLine("Pascal's Triangle");

            Console.WriteLine();

            Console.Write("Enter number of row: ");

            input = Console.ReadLine();

​

            if (Int32.TryParse(input, out inputNumber) == true)

            {

                if (inputNumber < 0)

                {

                    Console.WriteLine("Input number less than zero is not allowed.");

                }

                else if (inputNumber > 25)

                {

                    Console.WriteLine("Input number greater than 25 is not allowed.");

                }

                else if (inputNumber == 0)

                {

                    Console.WriteLine("The sum of numbers above row " + inputNumber + " is " + ((2 * (inputNumber)) - (2 * (inputNumber)) + "."));

                    Console.WriteLine("The sum of numbers in row " + (inputNumber + 1) + " is 2.");

                }

                else

                {

                    for (int number = 1; number <= (inputNumber - 1); number++)

                    {

                        counter *= 2;

                        aboveRowSum += counter;

                    }

                    for (int anotherNumber = 1; anotherNumber <= (inputNumber + 1); anotherNumber++)

                    {

                        nextRowSum *= 2;

                    }

                    Console.WriteLine("The sum of numbers above row " + inputNumber + " is " + (aboveRowSum + 1) + ".");

                    Console.WriteLine("The sum of numbers in row " + (inputNumber + 1) + " is " + nextRowSum + ".");

                }

            }

            else

            {

                Console.WriteLine("Invalid input. Only numeric values are allowed.");

            }

    }

}