Xiaohong has 5 coats and 3 pairs of trousers. He wants to match a set of clothes. How many different matching methods are there?
小红有5件上衣，3条裤子，他想搭配一套衣服，有多少种不同的搭配方法．
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>