There are 2 tops, a skirt and a pair of trousers in Little Red's closet. How many different combinations are there to make a set of clothes?
小红衣柜里有2件上衣、一条裙子和一条裤子，配成一套衣服有多少种不同的配法．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<result>4</result>