28 teams participate in a single-elimination match, and how many matches must be played before the champion can be determined.
28支球队参加单淘汰比赛，共要赛多少场，才能决出冠军来．
<gadget id="calculator">14 + 7 + 3 + 2 + 1</gadget>
<output>27</output>

<result>27</result>