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

### Instruction:
Oliver is working out in a gym. On Monday he worked out for 4 hours, and the next day for 2 hours less. On Wednesday he decided to work out twice as much as on Monday. On Thursday the gym was closed, so Oliver needed to exercise at home which took twice as much time as on Tuesday. How many hours in total have Oliver worked out during these four days?

### Response:
 Jumanne, Oliver alifanya mazoezi kwa saa 4 - saa 2 = <<4-2=2>>2.
Jumatano mazoezi yalimchukua Oliver saa 2 * 4 = <<2*4=8>>8.
Alhamisi, Oliver alifanya mazoezi mara mbili ya Jumanne, hivyo kwa saa 2 * 2 = <<2*2=4>>4.
Jumla ya masaa ya mazoezi ya Oliver ni saa 4 + saa 2 + saa 8 + saa 4 = <<4+2+8+4=18>>18.