number of joysticks

hey all. im the team captain from newtown h.s, and this is our first year doing first. im really excited about the competition and naturally as any rookie i got tons of questions. my first major problem is the amount of joysticks being used. i tried searching the forums and ive gone through the rule book and unless im blind and missed the answer, it just wasnt there. so, if anyone could help out, how many joysticks are being used to control the robot? and are we allowed to change the amount of joysticks we use? thx everyone