using System;

public class Program

{

    public static void Main()

    {

        DateTime bday = DateTime.Parse("2020/02/18");       

        DateTime today = DateTime.Today;        

        int age = today.Year - bday.Year;

        if(age < 5)

        {

                Console.WriteLine("yes");

        }

        else{

            Console.WriteLine("no");

            // dont allow

        }

}

}