using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Carlos Ivan Lopez Aldava");

          int n,i,sum;

  int mn,mx;

    Console.Write("\n\n");

    Console.Write("Find perfect numbers within a given number of range:\n");

    Console.Write("------------------------------------------------------");

    Console.Write("\n\n");    

  Console.Write("Input the starting range or number : ");

  mn = Convert.ToInt32(Console.ReadLine());  

  Console.Write("Input the ending range of number : ");

  mx = Convert.ToInt32(Console.ReadLine());  

  Console.Write("The Perfect numbers within the given range : ");

  for(n=mn;n<=mx;n++)

    {

    i=1;

    sum = 0;

    while(i<n)

    {

      if(n%i==0)

           sum=sum+i;

          i++;

    }

    if(sum==n)

      Console.Write("{0} ",n);

    }

    }

}