Homework: Make Chocolate

Imported By: Geoffrey Challen

/ Version: 2021.7.0

/ Adapted from CodingBat

We want make a package of goal kilos of chocolate. We have small bars (1 kilo each) and big bars (5 kilos each). Return the number of small bars to use, assuming we always use big bars before small bars. Return -1 if it can't be done. No loops are needed to solve this problem!