box of biscuits is 2 decimeters long, 1.5 decimeters wide, and 3 decimeters high. Now it is necessary to stick label paper around it. What is the area of this label paper?
一盒饼干长2分米，宽1.5分米，高3分米，现在要在它的四周贴上商标纸，这张商标纸的面积是多少平方分米？
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">1.5 * 3</gadget>
<output>4.5</output>

<gadget id="calculator">6 + 4.5</gadget>
<output>10.5</output>

<gadget id="calculator">10.5 * 2</gadget>
<output>21</output>

<result>21</result>