Xiaohong's family lives on the 5th floor. There are 16 stairs on each floor. How many stairs does she have to walk from the 1st floor to the 5th floor?
小红家住在5楼，每层楼梯有16级，她从1楼走到5楼，共要走多少级楼梯．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">16 * 4</gadget>
<output>64</output>

<result>64</result>