The Optical Hotel has 26 quadruple rooms, 56 triple rooms, and 209 double rooms. How many guests can the Optical Hotel accommodate at the same time?
光学酒店有四人间26间，三人间56间，双人间209间，光学酒店同时可以住多少客人？
<gadget id="calculator">26 * 4</gadget>
<output>104</output>

<gadget id="calculator">56 * 3</gadget>
<output>168</output>

<gadget id="calculator">209 * 2</gadget>
<output>418</output>

<gadget id="calculator">104 + 168 + 418</gadget>
<output>690</output>

<result>690</result>