A snail climbs up from the bottom of a cup with a depth of 12 cm. It takes 3 minutes for every 3 cm to climb, and then stops for 1 minute. How many minutes does it take for the snail to climb out of the cup from the bottom of the cup?
一只蜗牛从12厘米深的杯底往上爬，每爬3厘米要用3分钟，然后停1分钟，这时蜗牛从杯底爬出杯口时要用多少分钟？
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

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

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

<result>16</result>