Dig a tree pit every 5 meters along the side of the road (no need to dig on both sides of the road). The total length of the road is 1300 meters, and trees should be planted on both sides of the road. How many saplings are needed in total?
沿公路边每隔5米挖一个树坑，(公路两边不用挖)．公路全长1300米，要在公路两边都植上树．一共需要多少树苗？
<gadget id="calculator">1_300 / 5</gadget>
<output>260</output>

<gadget id="calculator">260 - 1</gadget>
<output>259</output>

<gadget id="calculator">259 * 2</gadget>
<output>518</output>

<result>518</result>