Plant trees on both sides of a 400-meter-long road, plant one tree every 5 meters, and each sapling costs two yuan. How much does it cost to buy these saplings?
在一条400米长的公路两旁植树，每隔5米植一棵，每棵树苗两元钱，买这些树苗共需要多少钱？
<gadget id="calculator">400 / 5</gadget>
<output>80</output>

<gadget id="calculator">80 + 1</gadget>
<output>81</output>

<gadget id="calculator">81 * 2 * 2</gadget>
<output>324</output>

<result>324</result>