The distance between every two floors of the Oriental Pearl Tower is 3 meters. How many meters did Xiao Gang climb from the 1st floor to the 20th floor?
东方明珠大厦每两层之间相距3米，小刚从1楼爬到20楼，一共爬了多少米？
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">3 * 19</gadget>
<output>57</output>

<result>57</result>