There are 5 pairs of black and white socks put together, at least how many socks need to be found in the dark, it will surely form a pair of socks of various colors in the body.
有黑色和白色的袜子各5双放在一起，黑暗中至少要摸出多少只袜子，就一定可以诶成一双体内各色的袜子．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>