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

### Instruction:
John received 20 gifts on his 12th birthday.  He received 8 fewer gifts on his 13th birthday.  How many total gifts did he receive between those two birthdays?

### Response:
 เขาได้รับ 20-8=12 ของขวัญในวันเกิดครบรอบที่ 13
ดังนั้นเขาได้รับทั้งหมด 20+12=<<20+12=32>>32 ของขวัญ