Xiao Ming uses two wooden sticks with a length of 2 meters and a length of 1 meter to form a rectangle. What is the perimeter of this rectangle in meters?
小明用两根长2米、两根长1米的木条摆成一个长方形，这个长方形的周长是多少米．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>