Find the answer to this math problem: John and DeSean bought a bag of marshmallows to make s'mores together. The bag has 35 marshmallows. Each S'more uses one marshmallow. If John makes 9 S'mores, DeSean makes 9 S'mores, and they dropped 3 marshmallows on the ground, how many S'mores can each kid have with the marshmallows left in the bag?