There are 16 squares with a side length of 1 cm, and they form a quadrilateral with the shortest perimeter. What is the perimeter in cm?
有16个边长1cm的正方形，拼成一个周长最短的四边形，它是周长是多少cm．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>