Put 3 red chopsticks, 9 yellow chopsticks, 18 green chopsticks and 1 black chopsticks in a cloth bag, at least how many chopsticks can be found in the dark to ensure that there are two pairs of chopsticks of the same color.
将3支红筷子，9支黄筷子，18支绿筷子和1支黑筷子混合放在一个布袋里，黑暗中至少摸出多少支，才能保证有两双颜色相同的筷子．
<gadget id="calculator">4 + 2 + 1 + 1 + 2 + 1</gadget>
<output>11</output>

<result>11</result>