Zhang Erxiao's family lives on the sixth floor, and the stairs between two adjacent floors are all 18 steps. How many steps does he have to climb from the first floor to the sixth floor?
张二小家住在六楼，相邻两个楼层之间的楼梯都是18个台阶．他从一楼到6楼一共要上多少个台阶．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

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

<result>90</result>