There are 5 pairs of socks in each of the five colors of red, yellow, blue, black, and white in a black cloth bag. At least how many socks must be taken out of the bag at a time to ensure that there are 2 pairs of socks (two are of the same color). a pair).
一只黑布袋中装有红、黄、蓝、黑、白五种颜色的袜子各5双，一次至少要从袋中取出多少只，才能保证其中有2双袜子(两只是同一种颜色的算一双)．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<result>8</result>