Luke gave Percy a pair of winged shoes that were cursed to fly Percy to the Underworld when he wore them. Percy can't use them because the sky is Zeus's domain, and Percy's dad is Poseidon. Zeus and Poseidon don't get along, so Percy doesn't want to anger Zeus by flying.
Answer:
Sticks and straw? :'D
If the first two brothers bought the one thing each that didn't quite fill up the room, then if the third brother both both it would fill the room. ??
