The harvest is good, and they must all be transported away. I can transport 30 boxes at a time, 20 times a day, and I can finish the shipment in 3 days. How many boxes of apples did Uncle Zhang's house receive?
丰收了，要把它们全运走．我一次能运30箱，每天运了20次，3天能运完．张叔叔家收了多少箱苹果？
<gadget id="calculator">30 * 20 * 3</gadget>
<output>1_800</output>

<result>1_800</result>