using System;
class SumOfDigits
{
    static void Main()
    {
        Console.Write("Enter a number: ");
        int num = Convert.ToInt32(Console.ReadLine());
        int sum = 0;

        while (num > 0)
        {
            sum += num % 10;
            num /= 10;
        }

        Console.WriteLine("Sum of digits: " + sum);
    }
}