Xiao Ming went upstairs and walked 36 levels from the first floor to the third floor. May I ask how many levels he needs to walk from the first floor to the sixth floor?
小明上楼，从第一层到第三层走了36级，请问他第1层到第六层，一共要走多少级．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

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

<result>90</result>