Disassemble several pairs of white, black, and red socks and put them in a box. These socks are of the same size and type, regardless of the left and right feet, and there are enough. Close your eyes and take out socks from the box at will, at least how many socks you take out , You can guarantee that it will be paired with 2 pairs.
把白色、黑色、红色的袜子各若干双拆乱了放在箱子里，这些袜子规格型号都相同，不分左右脚，且足够多，闭上眼睛随意从条箱子里取出袜子，至少取出多少只，就能保证配成2双．
<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<result>6</result>