Armstrong Number Program in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ArmstrongNumber
{
    class Program
    {
        static void Main(string[] args)
        {int n,m,s=0,r;
            Console.WriteLine("Enter a Number");
            n=Convert.ToInt16(Console.ReadLine());
            m = n;
            while (n > 0)
            {
                r = n % 10;
                s = s + r * r * r;
                n = n / 10;
            }
            if (m == s)
                Console.WriteLine("Armstrong Number");
            else
                Console.WriteLine("Not an Armstrong Number");
            Console.ReadKey();
        }
    }
}