12. Refactor Special Numbers

using System;

namespace RefactorSpecialNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            int num = int.Parse(Console.ReadLine());

            for (int i = 1; i <= num; i++)
            {
                int sum = 0;
                int counter = i;
                while (i > 0)
                {
                    sum += i % 10;
                    i /= 10;
                }
                bool special = (sum == 5) || (sum == 7) || (sum == 11);
                Console.WriteLine($"{counter} -> {special}");
                i = counter;
            }
        }
    }
}