Two people, A and B, compete to climb the stairs. A runs to the 4th floor, and B runs to the 3rd floor. According to this calculation, when A runs to the 16th floor, how many floors does B run to?
甲、乙两人比赛爬楼梯，甲跑到4层，乙恰好跑到3层楼．照这样计算甲跑到16层时，乙跑到了几层楼呢？
<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">15 * (2/3)</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<result>11</result>