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

### Instruction:
 约翰在他12岁生日收到了20份礼物。他在他13岁生日收到了比之前少8份礼物。在这两个生日之间，他总共收到了多少份礼物？


### Response:
 他在他13岁生日收到了20-8=12份礼物
所以他总共收到了20+12=<<20+12=32>>32份礼物