The little black bear climbed to the top of the 8-meter-high tree, but he could only climb up 2 meters at a time, and he had to slide down 1 meter. Then, how many times can he climb up to the top of the tree?
小黑熊爬到8米高的树顶，每次只能爬上2米，还要滑下1米，那么，它往上爬多少次才能爬到树顶．
<gadget id="calculator">8 - 2</gadget>
<output>6</output>

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

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>