If there are 3 kinds of bread and 4 kinds of drinks, how many ways to buy one drink and one piece of bread each time?
如果有3种面包和4种饮料，每次买一种饮料和一个面包，共有多少种买法．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>