There are 18 steps on each floor of a building. How many steps do you need to climb from the first floor to the sixth floor?
一栋楼每层有18个台阶，从一楼到六楼，要爬多少个台阶．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">18 * 5</gadget>
<output>90</output>

<result>90</result>