couples met at a party, each man shook hands with everyone except his wife, and women did not shake hands, how many times did they shake hands in total?
4对夫妇在一次聚会上相遇，每个男人都与除自己夫人以外的所有人握手，女人之间不握手，他们共握了多少次手．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

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

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

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

<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<result>18</result>