Side dishes. There are 2 meat dishes in the recipe, if you want the meat in the recipe. Vegetarian dishes are matched with one meat and two vegetables. There are 6 different matching methods. How many vegetarian dishes should be prepared?
配菜．菜谱有2个荤菜，如果想让菜谱的荤．素菜按一荤二素搭配，一共有6种不同的搭配方法，应该准备多少样素菜．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<result>3</result>