Xiaohong, Xiaoli, Xiaojun and Xiaoqiang give each other greeting cards before New Year's Day. If each person gives one card, how many greeting cards are needed in total?
小红、小丽、小军和小强在元旦前互赠贺卡，如果每人赠送1张，一共需要多少张贺卡．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<result>12</result>