There are 16 table tennis players in a knockout match. How many matches can the final champion be determined?
16名乒乓球选手进行淘汰赛，共多少场比赛才能决出最后冠军．
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">8 + 4 + 2 + 1</gadget>
<output>15</output>

<result>15</result>