There are 5 white gloves and 5 black gloves (regardless of left and right hands). If you are blindfolded, at least how many gloves should be taken out so that one pair of gloves must be of the same color.
有白色手套和黑色手套各5只(不分左右手)，如果蒙上眼睛，至少拿出多少只，才能使拿出的手套中一定有一双是同色的．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>