Number of Digits in a Number, C#

Number of Digits in a Number

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {            
            int a = Convert.ToInt32(Console.ReadLine());
            
            int OriginalValue = a;
            
            int count=0;
            
            while(a>0)
            {            
                if(a<=9)
                {
                    count = count + 1; 
                }
                else if(a>9)
                {
                    count = count + 2;
                }
                else if(a>99)
                {
                    count = count + 3;
                }
                
                a--;
            }            
            Console.WriteLine("Number is: " + OriginalValue + " \nDigits Count is: " + count);
        }
    }
}


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