Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Oliver had $9, then he saved $5 from his allowance and spent $4 on a frisbee and $3 on a puzzle. His friend gives him another $8 as it's his birthday. How much money does Oliver have left?

### Response:
 Oliver alikuwa na $9 mwanzoni, kisha akahifadhi $5 kutoka kwa posho yake.
Ametumia $4 kwa frisbee na $3 kwa puzzle.
Rafiki yake alimpa $8 kwa siku yake ya kuzaliwa.
Hivyo, Oliver ana $9 + $5 - $4 - $3 + $8 = $<<9+5-4-3+8=15>>15 dola zilizobaki.