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

### Instruction:
Mark started the day with 14 buttons. His friend Shane gave him 3 times that amount of buttons. Then his other friend Sam asked if he could have half of Mark’s buttons. How many buttons did Mark end up with?

### Response:
Mark started with 14 buttons.
Shane gave him 3 times that amount or 3 x 14 = <<3*14=42>>42 buttons.
Sam asked for half of Mark’s buttons or 42 / 2 = <<42/2=21>>21 buttons.
Mark ended up with 42 - 21 = <<42-21=21>>21 buttons.
#### 21

