Install street lamps on both sides of a road with a total length of 5 kilometers (both ends should also be installed), one every 50 meters. How many street lights will be installed in total?
在一条全长5千米的公路两旁装路灯(两端也要安装)，每隔50米安一座．一共要安装多少座路灯？
<gadget id="calculator">1_000 / 50</gadget>
<output>20</output>

<gadget id="calculator">5 * 20</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>