Now there are 5 black socks, 5 white socks, and 5 red socks, all of which are of the same specification. They are mixed together, and two pairs of socks of the same color are touched in the dark. At least how many socks can be taken to meet the requirements.
现在有黑色、白色、红色袜子各5只，它们的规格都一样，混杂地放在一起，黑暗中摸相同颜色的袜子两双，至少取多少只才能达到要求．
<gadget id="calculator">6 + 3 + 1</gadget>
<output>10</output>

<result>10</result>