If a tree is planted every 8 meters on a road with a length of 2000 meters, how many trees should be planted on both sides from the beginning to the end?
在一条长2000米的公路上每隔8米种一棵树，从头到尾两侧需要种多少棵树．
<gadget id="calculator">2_000 / 8</gadget>
<output>250</output>

<gadget id="calculator">250 + 1</gadget>
<output>251</output>

<gadget id="calculator">251 * 2</gadget>
<output>502</output>

<result>502</result>