There are 4 roads from the park to the zoo, and 3 roads from the zoo to the botanical garden. How many ways are there to go from the park to the botanical garden through the zoo?
从公园到动物园有4条路，从动物园到植物园有3条路，从公园经过动物园到植物园有几种走法？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>