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

### Instruction:
Anna, Alison, and Jeff collect stamps. Anna had 37 stamps in her collection, Alison had 28 stamps in her collection, and Jeff had 31 stamps in his collection. Alison gave Anna half of her collection in exchange for a novel, and then Anna traded Jeff two bluebird stamps for one mountain stamp. How many stamps did Anna have in the end?

### Response:
 Alison alimpa Anna 28 / 2 = <<28/2=14>>14 stempu.
Kwa kuongeza stempu za Alison kwenye mkusanyiko wa Anna, Anna sasa ana stempu 14 + 37 = <<14+37=51>>51.
Kisha Anna alibadilishana stempu 2 na Jeff, hivyo sasa ana stempu 51 - 2 = <<51-2=49>>49.
Anna alipata stempu 1 kwenye ubadilishanaji, hivyo mkusanyiko wake ulikuwa na stempu 49 + 1 = <<49+1=50>>50.