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

### Instruction:
Mark is looking to buy a total of 12 pieces of fruit at the store. He has already chosen 3 apples. He has also selected a bunch of bananas containing 4 bananas. How many oranges does he need to pick out to have 12 total pieces of fruit?

### Response:
The produce section has 3 apples, 4 bananas and needs to add 12 - 3 - 4 = <<12-3-4=5>>5 oranges
#### 5