Grandpa took 4 minutes to go from the first floor to the third floor. According to this calculation, how many minutes would it take him to go from the first floor to the fifth floor?
爷爷从一楼到三楼用了4分钟，照这样计算，他从一楼到五楼要用多少分钟？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

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

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

<result>8</result>