MagicDates

using System;
using System.Globalization;

class MagicDates

{
    static void Main(string[] args)
    {
        int startYear = int.Parse(Console.ReadLine());
        int endYear = int.Parse(Console.ReadLine());
        int MagicSum = int.Parse(Console.ReadLine());
        bool hasMagicSum = false;
        for (DateTime i = new DateTime(startYear,01,01); i <= new DateTime(endYear,12,31); i = i.AddDays(1))
        {
            int currentMagicSum = 0;
            string dateAsString = i.ToString("ddMMyyyy", CultureInfo.InvariantCulture);
            for (int j = 0; j  < dateAsString.Length; j++)

            {
              int  startDigit = int.Parse(dateAsString[j].ToString());

                for (int k = j + 1; k < dateAsString.Length; k++)
                {
                    int currentDigit = int.Parse(dateAsString[k].ToString());
                    currentMagicSum += startDigit * currentDigit;

                }
            }
            if (currentMagicSum == MagicSum)
            {
                hasMagicSum = true;
                Console.WriteLine(i.ToString("dd-MM-yyyy"));
            }

        }

        if (!hasMagicSum)
        {
            Console.WriteLine("No");
        }

    }

}