using System;

public class Program

{

    public static void Main(string[] args)

    {

        int number, Digit, MaxDigit = 0;

        Console.Write("Enter a positive number:");

        number = Convert.ToInt32(Console.ReadLine());

​

        while (number > 0)

        {

            Digit = number % 10;

            if (MaxDigit < Digit)

            {

            MaxDigit = Digit;

            }

            number /= 10;

        }

        Console.WriteLine("Largest digit:" + MaxDigit);

    }

}