The little monkey wants to climb a 6-meter-high tree, but every time he climbs 4 meters, he falls 2 meters again. How many times can the little monkey climb to the top of the tree?
小猴要爬上6米高的大树，可是每次他爬上4米后，他又掉下2米，小猴第几次才能爬上树顶？
<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<result>2</result>