500
The four signs
What is:
1) "As soon as the boy Eustace sets foot in Narnia, he will meet an old and dear friend. He must greet that friend at once. If he does, you will both have good help."
2)"You must journey out of Narnia to the north until you come to the city of the ancient giants."
3)"You shall find the writing on a stone in that ruined city, and you must do what the writing tells you."
4)"You will know the lost prince, if you find him, by this: that he will be the first person you have met in your travels who will ask you to do something in my name, in the name of Aslan."