using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine(isPascal(3));

        Console.WriteLine(isPascal(6));

        Console.WriteLine(isPascal(15));

        Console.WriteLine(isPascal(7));

        Console.WriteLine(isPascal(8));

    }

    public static int isPascal(int n)

        {

            if (n == 0)

                return 0;

            int sum = 0, i = 0;

            while (sum<n)

            {

                sum = sum + i;

                i++;

            }

            if (sum == n)

                return 1;

            return 0;

        }

​

}