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

### Instruction:
One-third of a class of 39 students took part in a math competition. How many students did not participate in the competition?

### Response:
 Sehemu ya tatu ya darasa ilishiriki katika mashindano, ambayo inamaanisha wanafunzi 39 * 1/3 = <<39*1/3=13>>13 walishiriki.
Hii inamaanisha kuwa wanafunzi 39 - 13 = <<39-13=26>>26 hawakushiriki katika mashindano.