There are 80 rectangular sheets of paper with a length of 2 cm and a width of 1 cm. Choose some of these papers and build a square as large as possible. What is the perimeter of the square in centimeters?
有80张长2厘米、宽1厘米的长方形纸．从这些纸中选择一些，拼一个尽可能大的正方形．拼成正方形的周长是多少厘米？
<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>