To make a rectangular light box frame, the length is 7 meters, the width is 1 meter, and the height is 3 meters. How many meters of iron bars are needed to make the light box frame?
做一个长方体的灯箱框架，长7米，宽1米，高3米，做这个灯箱框架共需要多少米铁条？
<gadget id="calculator">7 + 3 + 1</gadget>
<output>11</output>

<gadget id="calculator">11 * 4</gadget>
<output>44</output>

<result>44</result>