The children's lunch has 2 meat dishes and 3 vegetarian dishes. The children's daily lunch is one meat dish and one vegetarian dish. How many different tower matching methods are there?
小朋友的午餐有2份荤菜、3份素菜，小朋友们每天的午餐是一荤一素．一共有多少种不同的塔配方法．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>