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

### Instruction:
 莎拉、玛丽和图安决定一起去餐厅吃饭。他们决定平均分摊餐费。如果餐费总共是67美元，他们有一张4美元的优惠券，每个人需要贡献多少钱？


### Response:
 他们每个人需要贡献67-4=63美元。