It takes 1 minute for Uncle Li to go from the first floor to the second floor, so how many minutes does it take to go from the first floor to the fourth floor?
李大爷从一楼到二楼需1分钟，那么从一楼到四楼需多少分钟．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">1 / 1</gadget>
<output>1</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<result>3</result>