A box lunch in a fast food restaurant contains 1 meat dish and 1 vegetarian dish, and 5 meat dishes and 3 vegetarian dishes are prepared. How many ways are there in total?
某快餐店1份盒饭含1个荤菜和1个素菜，准备了5个荤菜和3个素菜，一共有多少种配菜法．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>