Multiple IFs won't work

I'm creating desktop app (console) for Windows using C#. This is my code:

    namespace myapp
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello!");
            Console.WriteLine("Type 'exit' to exit!");
            string line = Console.ReadLine();
            if (line == "exit")
            {
                Environment.Exit(0);
            }
            if (line == "copyright") {
                Console.WriteLine("Copyright 2017 TIVJ-dev");
            }
        }
    }
}

If I write "exit" it works fine (I'm sure it does this Environment.Exit(0);action), but If I write "copyright" it does not work. There comes only empty line. I started C# today, so sorry if this is very beginner problem. I still hope you guys can help me, I haven't found solution quickly on internet.