There are 10 steps in a staircase, but the 6th step is under maintenance, you can only step over it but not step on it. It is stipulated that each step can take one or two steps. After walking the stairs, how many different ways can there be?
一个楼梯共有10级台阶，但第6级台阶正在维修，只能跨过去而不能踩在此级台阶．规定每步可以迈一级或二级台阶．走完这这个楼梯，一共可以有多少种不同的走法．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">8 + 8</gadget>
<output>16</output>

<gadget id="calculator">8 + 16</gadget>
<output>24</output>

<result>24</result>