Chen Nan lives on the sixth floor of Jindu Garden, and there are 18 steps between every two floors. How many steps does Chen Nan need to walk from the first floor to the house?
陈楠家住金都花苑六楼，每两个楼层之间有18级台阶．陈楠从一楼走到家需要走多少级台阶．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

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

<result>90</result>