There are 22 lights on one side of a pedestrian street from the beginning to the end (there are lights at both ends), and the distance between every two adjacent lights is 12.82 meters. Please do the math, how many meters is this pedestrian street?
一条步行街的一边从头到尾共有22盏灯(两头都有灯)，每相邻两盏灯之间间隔12.82米．请你算一算，这条步行街长多少米？
<gadget id="calculator">22 - 1</gadget>
<output>21</output>

<gadget id="calculator">21 * 12.82</gadget>
<output>269.22</output>

<result>269.22</result>