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

### Instruction:
 凯文是一个水果摊贩。他每周总共卖出50箱水果。上周他卖了13箱葡萄，20箱芒果，剩下的都是热情果。他卖了多少箱热情果？


### Response:
 葡萄和芒果加起来是13+20 = <<13+20=33>>33箱。
剩下的是热情果，也就是17箱热情果。