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

### Instruction:
Bert bought some unique stamps for his collection. Before the purchase, he had only half the stamps he bought. If he bought 300 stamps, how many stamps does Bert have in total after the purchase?

### Response:
 Nusu ya stempu 300 ni 300/2 = <<300/2=150>>150 stempu.
Kabla ya ununuzi, Bert alikuwa na stempu 150.
Baada ya ununuzi, ana stempu 150 + 300 = <<150+300=450>>450.