There are 100 football teams, and there will be a knockout match in pairs. In the end, there will be a champion. How many games will there be in total?
有100个足球队，两两进行淘汰赛，最后产生一个冠军，共要赛多少场．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<result>99</result>