Ningbo Experimental Primary School bought 18 boxes of teaching aids, 27 pieces per box, and 5 yuan per box of teaching aids. How much does it cost to buy these teaching aids?
宁波市实验小学买来18盒教具，每盒27件，每盒教具5元，买这些教具要多少钱？
<gadget id="calculator">5 * 27 * 18</gadget>
<output>2_430</output>

<result>2_430</result>