cloth bag contains 8 red, yellow and blue socks each. Every time a sock is taken out of the cloth bag, at least how many socks must be taken to ensure that there are at least 2 pairs of socks of different colors.
一个布袋里有红、黄、蓝色的袜子各8只．每次从布袋中拿出一只袜子，至少要拿多少只才能保证其中至少有2双颜色不同的袜子．
<gadget id="calculator">8 + 2 + 1</gadget>
<output>11</output>

<result>11</result>