The teacher wants to set up a learning garden on one wall of the classroom. This learning field is a rectangle with a length of 1 meter and a width of 8 decimeters surrounded by colored paper. How many decimeters of colored paper should be used?
老师想在教室的一面墙上办一个学习园地．这个学习园地是用彩纸围成一个长1米，宽8分米的长方形．要用彩纸多少分米？
<gadget id="calculator">1 * 10</gadget>
<output>10</output>

<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>