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

### Instruction:
Alfred is storing a tonne of maize each month for the next 2 years.  If 5 tonnes are stolen and 8 tonnes are given to him as a donation, how many tonnes of maize does he have at the end of the 2 years.

### Response:
 Kabla ya mahindi yake kuibiwa au mchango kutolewa, anahifadhi tani 12 * 2 = <<12*2=24>>24 za mahindi.
Baada ya wizi wa mahindi, anabakiwa na tani 24 - 5 = <<24-5=19>>19 za mahindi.
Baada ya mchango wa mahindi, anabakiwa na tani 19 + 8 = <<19+8=27>>27 za mahindi.