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

### Instruction:
 玛丽有300只羊，鲍勃的羊的数量是玛丽的两倍再加上35只。玛丽必须买多少只羊才能比鲍勃少69只？


### Response:
 鲍勃有(300*2) + 35 = 635只羊。
玛丽要比鲍勃少69只羊，她必须拥有635 - 69 = 566只羊。
由于玛丽已经有300只羊，她必须再买566 - 300 = <<566-300=266>>266只羊。