Xiaogang's family lives on the 5th floor, and he has to walk 18 steps to go up each floor. How many steps does Xiaogang have to walk to get home from school?
小刚家住在5楼，每上一层楼都要走18级台阶，小刚放学回家一共要走多少级台阶．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">18 * 4</gadget>
<output>72</output>

<result>72</result>