using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello there, Grade 9.");

        Console.WriteLine("What year were you born?");

        float x =float.Parse(Console.ReadLine());

        float y = 2019f;

        float total = y - x;

        Console.WriteLine("You're " + total + " years old.");

    }

}