using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(GetYear(01, 2006));

    }

​

    static double GetYear(int d2, double cy)

    {

        double baseYear = cy - 50;

        double based2 = int.Parse(baseYear.ToString().Substring(2, 2));

        double first2 = Math.Truncate(baseYear / 100);

        if (d2 < 50)

            return (first2 * 100) + 100 + d2;

        else

            return (first2 * 100) + d2;

    }

}