12. Master Number

using System;

namespace _12._Master_Numbers
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            for (int i = 1; i <= n ; i++)
            {
                if (IsPalindromE(i) && SumOfDigits(i) && HasEvenDigit(i))
                {
                    Console.WriteLine(i);
                }
            }
        }

        static bool HasEvenDigit(int i)
        {
            int current = 0;
            bool hasEven = false;
            while (i != 0)
            {
                current = i % 10;
                if (current % 2 == 0)
                {
                    hasEven = true;
                    return hasEven;
                }
                i /= 10;
            }
            return hasEven;
        }

        static bool SumOfDigits(int i)
        {
            int sumDigit = 0;
            while (i != 0)
            {
                sumDigit += i % 10;
                i /= 10;
            }
            if (sumDigit % 7 == 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        static bool IsPalindromE(int i)
        {
            //bool isPalindrome = false;
            //int reversed = 0;
            //int oldNumber = i;
            //int power = i.ToString().Length - 1;
            //int loop = i.ToString().Length;
            //for (int j = 0; j < loop; j++)
            //{
            //    reversed += i % 10 * (int)Math.Pow(10, power);
            //    power--;
            //    i /= 10;

            //}
            //if (reversed == oldNumber)
            //{
            //    return true;
            //}
            //else
            //{
            //    return false;
            //}
            int reversed = 0;
            int oldNumber = i;
            while (i != 0)
            {
                reversed *= 10;
                reversed += i % 10;
                i /= 10;
            }
            if (reversed == oldNumber)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}