using System;

public class Program

{

    static bool isValidDate(int dd, int mm, int yyyy){

    }

    public static void Main()

    {

        Console.WriteLine("input date one by one dd/mm/yyyy");

        string day=Console.ReadLine();

        string month=Console.ReadLine();

        string year=Console.ReadLine();

        int dd = Convert.ToInt32(day);

        int mm = Convert.ToInt32(month);

        int yyyy = Convert.ToInt32(year);

        if(isValidDate(dd,mm,yyyy))

            Console.WriteLine("is valid date\n");

        else

            Console.WriteLine("is not valid date\n");

    }

}