It took Uncle Li 8 minutes to walk from the first floor to the third floor. According to this calculation, how many minutes does it take him to go from the first floor to the fifth floor?
李大爷从一楼走到三楼用了8分钟，照这样计算，他从一楼到五楼一共需要多少分钟？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>16</result>