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

### Instruction:
 农夫布朗喂了7只鸡和5只羊。他喂的动物中一共有多少只腿？


### Response:
 鸡有7*2=<<7*2=14>>14只腿。
羊有5*4=<<5*4=20>>20只腿。
一共有14+20=<<14+20=34>>34只腿。