The circus has prepared 3 different hats and 4 coats of different styles. How many different costumes can the circus perform at most?
马戏团准备了3顶不同的帽子，4件不同样式的大衣，马戏团最多可以表演出多少种不同的装束．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>