There are 16 teams in the knockout round, how many games will be played in order to decide the champion.
16支球队进行淘汰赛，为了决出冠军，要进行多少场比赛．
<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>