Sum of digits

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

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int sum = 0;
            do
            {
                sum += n % 10;
                n = n / 10;
            }
            while (n>0);
            Console.WriteLine("Sum of digits {0}", sum);
            Console.ReadLine();
        }
    }
}