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

### Instruction:
 苏珊有21只猫，鲍勃有3只猫。如果苏珊把她的4只猫给了鲍勃，苏珊比鲍勃多几只猫？


### Response:
 给出4只猫后，苏珊剩下21 - 4 = <<21-4=17>>17只猫。
苏珊比鲍勃多14只猫。