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

### Instruction:
Sonny received 45 boxes of cookies from his friend yesterday. He gave 12 to his brother, 9 to his sister, and he gave 7 to his cousin. How many boxes of cookies were left for him?

### Response:
 เขาเหลือกล่องคุกกี้ 45 - 12 - 9 - 7 = <<45-12-9-7=17>>17 กล่อง.