There are a total of 16 teams participating in the finals of the European Football Championship. First, they are divided into four groups for the group stage. Every two teams in each group have to play one game. So how many group games will the four groups have in total?
欧洲足球锦标赛共有16支球队参加决赛，先平均分成四个组进行小组赛，每组中每两支球队之间都要赛一场，那么四个组一共要进行多少场小组赛．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>