There are 12 teams competing. The organizing committee first organizes all the teams into groups of 4 for a single round-robin match. The top two teams in each group will enter the second stage of the competition, and then let the remaining 6 teams play a single round-robin match. , to determine the champion and runner-up. How many games does this take?
有12支球队进行比赛，组委会先将所有的球队每4个队编为一组进行单循环赛，每组前两名进入第二阶段比赛，再让剩余的6队进行一次单循环赛，决出冠、亚军．这样共需比赛多少场？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 2 * 3</gadget>
<output>18</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">4 / 2 / 2</gadget>
<output>1</output>

<gadget id="calculator">5 * 3 * 1</gadget>
<output>15</output>

<gadget id="calculator">18 + 15</gadget>
<output>33</output>

<result>33</result>