There are 20 gloves of 6 colors in the box, at least how many gloves can be caught to ensure that there are three pairs of gloves with different colors? How many.
箱内有6种颜色的手套各20只，至少抓多少只才能保证有三副颜色都不相同的手套？多少．
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">40 + 4 + 1</gadget>
<output>45</output>

<result>45</result>