A snail fell into an 8-meter-deep dry well. It climbed 3 meters during the day and slid down 2 meters at night. How many days did it take to climb the well platform?
一只蜗牛掉在8米深的枯井里，它白天爬上3米，晚上滑下2米，它到第几天才能爬上井台？
<gadget id="calculator">8 - 3</gadget>
<output>5</output>

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

<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>