using System;

public class Program

{

    public static void Main()

    {

        int number,sum=0,n;

        Console.WriteLine("PERFECT NUMBER");

        Console.WriteLine("Enter the number:");

        number=int.Parse(Console.ReadLine());

        n=number;

        for(int i=1;i<number;i++)

        {

            if(number%i==0)

            {

                sum=sum+i;

            }

        }

            if(sum==n)

            {

                Console.WriteLine("Number is a perfect number");

                Console.ReadLine();

            }

            else

            {

                Console.WriteLine("Number is not a perfect number");

                Console.ReadLine();

            }

    }   

}