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

### Instruction:
John buys 2 packs of index cards for all his students.  He has 6 classes and 30 students in each class.  How many packs did he buy?

### Response:
John has 6*30=<<6*30=180>>180 students
So he bought 180*2=<<180*2=360>>360 packs
#### 360