using System;

public class Program

{

    public static void Main()

    {

        int num ,x=0,z=0,y=0 , sum=0 ;

        Console.WriteLine("please enter 3 digits intger number:");

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

        //while( num != -1 )

        //{

            while (num>=100 && num<=999)

            {

                sum = sum +num;

                Console.WriteLine("the number is 3 digits");

                x =num % 10;

                y=(num / 10) %10;

                z=(num/100)%10;

                Console.WriteLine("x+y+z=" + (x+y+z));

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

                Console.WriteLine(num+sum);

                if(sum%5==0)

                {

                Console.WriteLine("the sum= {0}",sum);

                }

            }

            Console.WriteLine("The number illegal");

    }   

}