Plant trees on both sides of a 500-meter-long road, and plant one tree every 5 meters (both ends are planted), how many trees need to be planted in total.
在一条长500米的道路两旁栽树，每隔5米栽一棵(两端都栽)，一共需要栽多少棵树．
<gadget id="calculator">500 / 5</gadget>
<output>100</output>

<gadget id="calculator">100 + 1</gadget>
<output>101</output>

<gadget id="calculator">101 * 2</gadget>
<output>202</output>

<result>202</result>