There are 20 elementary schools, 15 junior high schools, and 12 high schools in a certain district. How many different ways of going from elementary school to high school are there in this district?
某区有20所小学，15所初中，12所高中，在该区共有多少种不同的从小学读到高中的方式？
<gadget id="calculator">20 * 15 * 12</gadget>
<output>3_600</output>

<result>3_600</result>