Nellie just bought a new perfume called Rose Honey. It comes in a bottle shaped like a rectangular prism. The bottle is 4 centimeters long, 2 centimeters wide, and 7 centimeters
tall, but the perfume's box says the bottle only contains 45 milliliters, or 45 cubic
centimeters, of perfume.
How many more milliliters of perfume would it take to completely fill the bottle?
Write your answer as a whole number or decimal. Do not round.