An office building has 18 floors, each floor has 45 windows, and each window has 2 panes of glass. How many panes of glass does this building have?
一座办公大楼有18层，每层有45个窗口，每个窗口有2块玻璃，这座大楼一共有多少块玻璃？
<gadget id="calculator">2 * 45 * 18</gadget>
<output>1_620</output>

<result>1_620</result>