A and B are in a stair climbing competition. When A reaches the third floor, B happens to reach the second floor. According to this calculation, when A runs to the 9th floor, how many floors does B go to?
甲乙两人进行爬楼梯比赛，当甲跑到3楼时，乙恰好跑到2楼．照这样计算，当甲跑到9楼时，乙跑到多少楼．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

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

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

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

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">8 * (1/2)</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>