There are 12 pairs of red gloves and 5 pairs of white gloves in the cloth bag, at least how many pairs can be found at a time to ensure that they can be paired into a pair of gloves of the same color. (Gloves are left and right)
布袋里有12双红手套和5双白手套，一次至少摸出多少只才能保证能配成一双相同颜色的手套．(手套有左右之分)
<gadget id="calculator">12 + 5 + 1</gadget>
<output>18</output>

<result>18</result>