Xiao Ming goes upstairs and needs to walk 36 steps from the first floor to the fourth floor. How many steps do he need to walk from the third floor to the seventh floor?
小明上楼，从第一层走到第四层需要走36级台阶，如果从第三层到第七层需要走多少级台阶．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>