There are 18 classrooms in the teaching building, each classroom has 4 windows, and each window needs to be installed with 8 pieces of glass. How many pieces of glass are needed in total?
教学楼共有18间教室，每间教室有4扇窗子，每扇窗子需要安装8块玻璃，一共需要多少块玻璃？
<gadget id="calculator">8 * 4 * 18</gadget>
<output>576</output>

<result>576</result>