During the New Year's Eve party, each of the 7 children who participated in the dance performance hugged once, how many times did they hug in total?
元旦晚会时，参加舞蹈演出的7个小朋友到场后每两人都拥抱一次，一共拥抱了多少次．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">6 * (7/2)</gadget>
<output>21</output>

<result>21</result>