using System;

public class Program

{

    public static void Main()

    {

        int num, sum=0, n ;

        Console.WriteLine("perfect number");

        Console.WriteLine("enter the number");

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

        n=num;

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

        {

            if(num%i==0)

            {

                sum= sum + i;

            }

        }

        if(sum==n)

        {

            Console.WriteLine("entered number is perfect no");

            Console.ReadLine();

        }

        else

        {

            Console.WriteLine("entered number is not perfect no");

            Console.ReadLine();

        }

    }

}