There are 8 black, yellow and white chopsticks, mix them together and put them together. At least how many chopsticks must be found in the dark to ensure that a pair of chopsticks can be found? (Two of the same color are a pair)
有黑色，黄色，白色的筷子各8根，混合后放在一起．黑暗中至少要摸出多少根筷子才能保证摸出1双筷子？(颜色相同的两根为一双)
<gadget id="calculator">8 + 1 + 1 + 1</gadget>
<output>11</output>

<result>11</result>