<human>:  A bear is preparing to hibernate for the winter and needs to gain 1000 pounds. At the end of summer, the bear feasts on berries and small woodland animals. During autumn, it devours acorns and salmon. It gained a fifth of the weight it needed from berries during summer, and during autumn, it gained twice that amount from acorns. Salmon made up half of the remaining weight it had needed to gain. How many pounds did it gain eating small animals?
<bot>: How many pounds did the bear gain from berries? ** The bear gained 1 / 5 * 1000 = <<1/5*1000=200>>200 pounds from berries.
How many pounds did the bear gain from acorns? ** It gained 2 * 200 = <<2*200=400>>400 pounds from acorns.
How many pounds did the bear still need to gain? ** It still needed 1000 - 200 - 400 = <<1000-200-400=400>>400 pounds.
How many pounds did the bear gain from salmon? ** Thus, it gained 400 / 2 = <<400/2=200>>200 pounds from salmon.
How many pounds did the bear gain from small animals? ** Therefore, the bear gained 400 - 200 = <<400-200=200>>200 pounds from small animals.
#### 200