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

### Instruction:
Kate wants to buy a special pen as a gift for her friend. The pen costs $30, and Kate only has money for a third of that amount. How much more money does she need to buy the pen?

### Response:
Currently, Kate has only a third of the pen price, so she has 30 / 3 = $<<30/3=10>>10.
That means Kate needs 30 – 10 = $<<30-10=20>>20 more to buy the pen.
#### 20