There are 47 trees on one side of the road, and the distance between two adjacent trees is 50 meters. If street lights are installed every 23 meters on this side of the road (both ends must be installed), how many street lights need to be installed in total.
马路的一侧有47棵树，相邻两棵树之间的距离是50米，如果在这一侧的马路上每隔23米安装路灯(两头都要装)，共需要安装路灯多少盏．
<gadget id="calculator">47 - 1</gadget>
<output>46</output>

<gadget id="calculator">46 * 50</gadget>
<output>2_300</output>

<gadget id="calculator">2_300 / 23</gadget>
<output>100</output>

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

<result>101</result>