A willow tree is planted every 8 meters on the lake surface of the park. There are 41 willow trees in total. Now two stone chairs are placed between every two willow trees. How many sheets are there in total?
公园的湖面一周每隔8米种一棵柳树，共有41棵柳树，现在要在每两棵柳树之间放两张石椅．一共要放多少张？
<gadget id="calculator">41 * 2</gadget>
<output>82</output>

<result>82</result>