A road used to have 23 electric poles (both ends), and the distance between each two is 15 meters. Now it needs to be transformed into a distance of 30 meters between each two. How many electric poles are missing after the transformation?
一条路原有23根电线杆(两端都有)，每两根之间相隔15米，现在要改造成每两根之间相隔30米，改造后少了几根电线杆？
<gadget id="calculator">23 - 1</gadget>
<output>22</output>

<gadget id="calculator">15 * 22</gadget>
<output>330</output>

<gadget id="calculator">330 / 30</gadget>
<output>11</output>

<gadget id="calculator">11 + 1</gadget>
<output>12</output>

<gadget id="calculator">23 - 12</gadget>
<output>11</output>

<result>11</result>