The chicken farm shipped 500 bags of feed, 128 bags were used to feed the chickens, and 343 bags were used to feed the pigs. How many bags are left?
养鸡场运来500袋饲料，喂鸡用了128袋，喂猪用了343袋，还剩下多少袋？
<gadget id="calculator">500 - 128 - 343</gadget>
<output>29</output>

<result>29</result>