Hans went to a pet shop. He bought 15 gold fish and 7 blue fish. How many fish did he buy? Think step-by-step.
We add 15 to 7 and get 22. Thus, Hans bought 22 fish at the pet shop.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Hans went to a pet shop. He bought 15 gold fish and 7 blue fish. How many fish did he buy? Think step-by-step.

### Response:
We add 15 to 7 and get 22. Thus, Hans bought 22 fish at the pet shop.