The school football team wants to buy a set of football uniforms for the young football players. Now there are three tops and five pairs of shorts for them to choose from. How many choices do they have in total?
学校足球队要为小足球队员购置一套足球服，现在有三件上衣，5条短裤供他们选择，他们一共有多少种选择．
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>