While you were idly turning over the pages of "The History of the Ancient World" encyclopedia, a little sheet of paper slipped out of it. Your amazement had no limits when you understood it was a real treasure map. Of course, you departed immediately. But when you were standing on the place which in the map was marked with a thick red cross, you saw a big rock in front of you and nothing more. Looking at it in despair, you've discerned some strange signs scratched on the rock. It's just a riddle that you are to solve to reach the treasure.