using System;

public class Program

{

    public static void Main()

    {

        //1 - Design and implement a program that asks the user to enter a number and determines if the number entered is a perfect number.  

        //A perfect number is a number that is equal to the sum of its factors excluding the number itself.  

        //6 is a perfect number because 1 + 2 + 3 = 6. 28 is the next perfect number. 

        /*Display instructions

        user enters in perfectNumber

        Calculation for determining if number is perfect number

        if number is a perfect number

            display your number is a perfect number

        else if number is not a perfect number

            display your number is not a perfect number

        */

        Console.WriteLine("Please enter in a number and I will tell you if the number you enetered is a perfect number.");

        Console.Write("Please enter your number: ");

        int perfectNumber = Convert.ToInt32(Console.ReadLine());

        int sum = 0;

        int divisor = 1;

        while (divisor < perfectNumber)

        {

            if (perfectNumber % divisor == 0)

                sum = sum + divisor;

        }   

        if (sum == perfectNumber)

            Console.Write("The number you enetered is a not a perfect number.");

        else

            Console.Write("The number you entered is a perfect number.");

    }

}