3 squares with a side length of 1 cm are used to make a rectangle, what is the perimeter of the rectangle?
用边长为1厘米的3个正方形拼一个长方形，所拼长方形的周长是多少厘米
<gadget id="calculator">1 + 1 + 1</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>