A road is 1 km long, and there are telephone poles every 20 meters. From the starting point to the end point of this road, how many telephone poles are there on both sides?
一条路长1千米，每隔20米有一根电线杆．这条路从起点到终点，两边一共有多少根电线杆．
<gadget id="calculator">1_000 / 20</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>