Chloe and Charlie are taking a trip to the pet store to purchase some items for their new puppy. They know they need a bag of food that costs $7, and they also want to purchase some new toys for the puppy. They find a bargain barrel containing toys that cost $2 each. If Chloe has $30 with her and Charlie has one-third of this amount with him, what is the maximum number of toys they can purchase?