The teaching building of Hope Primary School has 4 floors, and each floor has 9 classrooms, with an average of 40 people in each classroom. How many people can sit in total?
希望小学教学楼共有4层，每层有9个教室，平均每个教室坐40个人．一共能坐多少人？
<gadget id="calculator">9 * 4 * 40</gadget>
<output>1_440</output>

<result>1_440</result>