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

### Instruction:
While at the lake, Cohen saw 300 fish-eater birds that had migrated into the area recently walking by the lake, eating the fish they had caught. The number of birds at the lake doubled on the second day and reduced by 200 on the third day. How many fish-eater birds did Cohen see in the three days?

### Response:
 Kwa kuwa kulikuwa na ndege 300 kwenye ziwa siku ya kwanza, idadi iliongezeka mara mbili hadi 2*300 = <<300*2=600>>600 ndege siku ya pili.
Jumla ya ndege wala wanaokula samaki ambao Cohen aliwaona kwenye ziwa katika siku mbili ni 300+600 = <<300+600=900>>900
Siku ya tatu, idadi ya ndege kwenye ziwa ilipungua hadi 600-200 = <<600-200=400>>400 ndege
Katika siku tatu, Cohen aliwaona ndege 400+900 = <<400+900=1300>>1300 wala wanaokula samaki kwenye ziwa.