Install street lights on both sides of a greenway in a park (both ends must be installed). The total length of this greenway is 1500m, and a streetlight is installed every 30m. How many streetlights will be installed in total?
在某公园绿道的两旁装路灯(两端都要装)，这条绿道全长1500m，每隔30m装一盏路灯，一共要装多少盏路灯？
<gadget id="calculator">1_500 / 30</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>