There are 8 black, white, yellow, and red chopsticks each, and they are mixed together, and some chopsticks are taken out in the dark. In order to make these chopsticks match two pairs of chopsticks (two chopsticks of the same color are one pair), how many chopsticks should be taken at least to meet the requirements?
黑色、白色、黄色、红色的筷子各有8根，混杂放在一起，在黑暗中取出一些筷子．要使得这些筷子能够搭配出两双筷子(两根筷子颜色相同即为一双)，那么最少要取多少根才能保证达到要求？
<gadget id="calculator">4 + 1 + 1 + 1</gadget>
<output>7</output>

<result>7</result>