There are 5 black, white, and blue gloves each (regardless of the left and right hands), at least how many gloves must be taken out (don't look at the color when holding it), so that two pairs of the gloves taken out must be of the same color.
有黑色、白色、蓝色手套各5只(不分左右手)，至少要拿出多少只(拿的时候不许看颜色)，才能使拿出的手套中一定有两双是同颜色的．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<result>10</result>