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

### Instruction:
 杰克为他的3个孩子每人缝制3件衬衫。每件衬衫上有7个纽扣。杰克必须使用多少个纽扣来缝制所有的衬衫？


### Response:
 所有孩子的衬衫总数是3 * 3 = <<3*3=9>>9件。
所需纽扣的总数是7 * 9 = <<7*9=63>>63个。