The school has 3 rows of houses, each row has 9 classrooms, and each classroom is equipped with 8 lamps. How many lamps are installed in total?
学校有3排房子，每排有9个教室，每个教室装8盏灯，一共安装多少盏灯？
<gadget id="calculator">8 * 9 * 3</gadget>
<output>216</output>

<result>216</result>