The school's teaching building has 16 steps to go up each floor, so Xiao Ming walked from the first floor to the fourth floor, and then returned to the second floor, how many steps did Xiao Ming walk in total?
学校的教学大楼每上一层要走16个台阶，那么小明从1楼走到4楼，然后回到2楼，小明一共走了多少级台阶？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

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

<gadget id="calculator">5 * 16</gadget>
<output>80</output>

<result>80</result>