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

### Instruction:
There are 8 red pens in Maria's desk drawer. There are 10 more black pens than red pens. There are also 7 more blue pens than red pens. How many pens are there in all?

### Response:
 Kuna kalamu nyeusi 8+10=<<8+10=18>>18, na kalamu buluu 8+7=<<8+7=15>>15.
Jumla, kuna kalamu 8+18+15=<<8+18+15=41>>41.