There are a total of 18 countries or regions participating in the Asian Games basketball game. Each group of 6 teams will conduct a group round robin match. How many games will be played in the group match?
亚运会篮球赛共有18个国家或地区参加，每6队为一组，进行小组循环赛，这样小组赛共需打多少场．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">18 / 6</gadget>
<output>3</output>

<gadget id="calculator">6 * (5/2) * 3</gadget>
<output>45</output>

<result>45</result>