using System;

public class Program

{

    public static void Main()

    {

        double num;

        Console.WriteLine("Enter a integer number:");

        num = Convert.ToDouble(Console.ReadLine());

        if (num > 0)

            {

            Console.WriteLine(" Positive number");

            }

        else 

           if ( num < 0 )

          {

            Console.WriteLine(" Negative number");

          }

          else 

          {

              Console.WriteLine("Null number");

          }

     }      

    }