In reply to xplorer: Agree with that, if you are climbing with someone who has 1 or 2 you could perhaps get away with it, or just buy 1 to compliment your mates.
Ridges won't have much ice on them, easy gullies up to grade II won't have much ice other than a short step or 2 which you can protect with 1 screw. Would be nice to have 3, so you have 1 for the pitch and 2 for a belay, but you can manage with 1 or 2 on easy routes.
Enjoy.