A road is 2,228 meters long. Now a tree is planted every 4 meters on both sides of the road. How many saplings are needed?
一条公路共长2228米，现在路的两旁每隔4米种一棵树，那么需要多少棵小树苗？
<gadget id="calculator">2_228 / 4</gadget>
<output>557</output>

<gadget id="calculator">557 + 1</gadget>
<output>558</output>

<gadget id="calculator">558 * 2</gadget>
<output>1_116</output>

<result>1_116</result>