If 20 teams compete in a single round-robin match, and the top four will go through a knockout match to determine the champion, how many games will there be in total?
20支队伍进行单循环赛，最后前四名再进行淘汰赛决定冠军，则一共要比赛多少场？
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">19 / 2</gadget>
<output>19/2 = around 9.5</output>

<gadget id="calculator">20 * (19/2)</gadget>
<output>190</output>

<gadget id="calculator">190 + 2 + 1</gadget>
<output>193</output>

<result>193</result>