Xiao Ming's family lives on the 5th floor. There are 18 steps to walk from the first floor to the second floor. There are the same number of steps between each floor. How many steps does Xiao Ming have to walk to and from school every day?
小明家住在5楼，从一楼到二楼要走18个台阶，各楼层间的台阶一样多，小明每天上学、放学要走多少级的台阶？
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">18 / 1</gadget>
<output>18</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">18 * 4 * 2</gadget>
<output>144</output>

<result>144</result>