Beibei goes to the supermarket to buy a ballpoint pen and a soft-covered copybook. She finds that there are 5 kinds of ballpoint pens and 3 kinds of soft-covered copies. How many different ways can she buy them?
贝贝去超市买一支圆珠笔和一本软面抄，她发现有5种圆珠笔，3种软面抄，她共有多少种不同的买法．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>