3: Powered By Fate
From p. 80 of Fate Core
Each player gets a number of fate points to start each session off with. That total is called the refresh rate. The refresh for a default, starting character is three fate points, but you can opt to spend up to two of your refresh to buy additional stunts.
You might end a session of play with more fate points than your actual refresh. If that happens, you don’t lose the additional points when you start the next session, but you don’t gain any either.