1–4 camels: nothing.
5–9 camels: 1 sheep.
10–14 camels: 2 sheep.
15–19 camels: 3 sheep.
20–24 camels: 4 sheep.
For example, 10 and 14 camels have the same due amount, while reaching 15 increases it to three sheep. Each bracket begins at a specified threshold.