A primary school teaching building has 4 floors, each floor has 25 classrooms, and 6 electric fans are installed in each classroom. How many electric fans are installed in this elementary school teaching building?
一间小学教学楼有4层，每层有25间教室，每间教室安装了6台电风扇．这所小学教学楼一共安装了多少台电风扇？
<gadget id="calculator">25 * 4 * 6</gadget>
<output>600</output>

<result>600</result>