Return to List## Homework: Make Chocolate

### Related Lessons

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!

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