The height of the tree is 5 feet. The little monkey jumps up 3 feet every minute and retreats one foot. Ask the little monkey how long it takes to jump to the top of the tree?
树高5尺，小猴每分钟跳上3尺，退回一尺，问小猴几分钟可以跳到树尖上？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<result>2</result>