A snail climbed up from the bottom of a 30-meter-deep well. On the first day, it climbed up 6 meters; Mi...According to this rule, how many days will it take for the snail to climb to the mouth of the well?
一只蜗牛从深30米的井底向上爬，第一天向上爬了6米；第二天休息，于是向下滑了4米；第三天再向上爬6米；第四天又向下滑4米…按这样的规律进行下去，蜗牛第几天才能爬到井口？
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<result>25</result>