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

### Instruction:
 Kiasi cha juu salama cha kafeini unaweza kuitumia kwa siku ni 500 mg. Ikiwa kila kinywaji cha nishati kina 120 mg ya kafeini na Brandy anakunywa 4, anaweza kunywa kiasi gani cha kafeini salama zaidi siku hiyo?


### Response:
 Brandy anakunywa 480 mg ya kafeini kwa sababu 4 x 120 = <<4*120=480>>480
Anaweza kunywa bado 20 mg ya kafeini kwa sababu 500 - 480 = <<500-480=20>>20