using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int sum = 0;

        for(int i = 1; i<10000; i++)

        {

            sum = 0;

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

            {

                if(i % j == 0)

                {

                    sum = sum + j;

                }

            }

            if(i == sum)

            {

                Console.WriteLine("PFNumber:{0}", i);

            }

        }

    }

}