using System;

public class Program

{

    public static void Example()

    {

        Console.WriteLine("Enter number");

        string text = Console.ReadLine();

        int number = int.Parse(text);

        Console.WriteLine(number);

        return;

    }

    public static void Main()

    {

        try{

        Example();

        }

            catch(FormatException e)

            {

                Console.WriteLine("Input invalid number");

                Console.WriteLine(e.Message);

    }

}

}