If trees are planted on both sides of a 200-meter-long road, and one tree is planted every 4 meters, how many trees should be planted in total?
在一条长200米的公路两旁植树，每隔4米种一棵，一共需植多少棵树．
<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">50 + 1</gadget>
<output>51</output>

<gadget id="calculator">51 * 2</gadget>
<output>102</output>

<result>102</result>