There are 3 pairs of gloves of four different colors in the closet. Take gloves from the closet in the dark. To ensure that you can get a pair of gloves with the same color and matching left and right, at least how many gloves should you take.
衣柜中有四种不同颜色的手套各3双，黑暗中从衣柜中取手套，为确保能取得一双颜色相同且左、右相配对的一双手套，至少要取多少只手套．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<result>13</result>