There are 4 tops, 3 pairs of pants, and 2 skirts. Choose a top and a bottom to wear together. How many different ways can you wear it?
有4件上衣，3条裤子，2条裙子，选一件上衣与一件下衣搭配穿，有多少种不同的穿法？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">12 + 8</gadget>
<output>20</output>

<result>20</result>