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

### Instruction:
 伊莎贝尔在前院的树上帮助她妈妈摘苹果。他们一起摘了34个苹果。他们想做苹果派。每个苹果派需要4个苹果，但苹果必须成熟。他们摘的苹果中有6个不成熟。他们能做多少个派？


### Response:
 伊莎贝尔有34个苹果 - 6个不成熟的苹果 = <<34-6=28>>28个成熟的苹果。
要做派，他们需要28个苹果 / 每个派4个苹果 = <<28/4=7>>7个派。