There are 3 tops, a skirt and a pair of trousers in Xiaohong's closet. How many different combinations are there in a set of clothes?
小红的衣柜里有3件上衣，一条裙子和一条裤子，配成一套衣服一共有多少种不同的配法．
<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<result>6</result>