3 small squares with a side length of 1 meter are used to form a rectangle. What is the perimeter of the rectangle in meters?
用3个边长为1米的小正方形拼成一个长方形，这个长方形的周长是多少米？
<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>