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

### Instruction:
 Diego alipika keki 12 kwa ajili ya siku ya kuzaliwa ya dada yake. Donald pia alipika keki 4, lakini alikula 1 wakati akisubiri sherehe ianze. Kuna keki ngapi zilizobaki?


### Response:
 Diego alipopika keki 12, idadi ya jumla ya keki ilikuwa 12+4 = <<12+4=16>>16 keki.
Hata hivyo, Diego alikula keki 1, kwa hiyo kuna keki 16 - 1 = <<16-1=15>>15 zilizobaki.