Code for Armstrong Number

using System;
namespace Console_Armstrong
{
    class Armstrong
    {
        int num,n=0,r,sum=0;
        public void dispArm()
        {
            Console.WriteLine("Enter number :");
            num = int.Parse(Console.ReadLine());
            n = num;
            while (n > 0)
            {
                r = n % 10;
                n = n / 10;
                sum += r * r * r;
            }
            if (sum == num)
            {
                Console.WriteLine("{0} is a amrstrong",num);
            }
            else
            {
                Console.WriteLine("{0} is numt a armstrong", num);
            }
        }
        static void Main(string[] args)
        {
            Armstrong arm = new Armstrong();
            arm.dispArm();
            Console.ReadKey();
        }
        //output: 0,1,153,370,371,407
    }
}