using System;

public class Program

{

    public static void Main()

    {

        try

        {

        Console.WriteLine("Indtast et tal");

        int input = Convert.ToInt32(Console.ReadLine());

        int tal = input + 12;

        Console.WriteLine(tal);

        }

        catch

        {

        Console.WriteLine("Brug kun tal");

        }

    }

}