Five hundred crowns. Here's the speech where he hands it over to Orlando, from Act 2, Scene 3:
But do not so. I have five hundred crowns,
The thrifty hire I sav'd under your father,
Which I did store to be my foster-nurse,
When service should in my old limbs lie lame,
And unregarded age in corners thrown.
Take that, and He that doth the ravens feed,
Yea, providently caters for the sparrow,
Be comfort to my age! Here is the gold;
All this I give you.