There are 24 chopsticks of 6 colors with exactly the same shape, length, and quality. How many chopsticks should be found in the dark at least to ensure that 8 pairs of chopsticks can be found (two of each pair of chopsticks have the same color).
有形状、长短、质量完全一样的6种颜色的筷子各24根，在黑暗中至少应摸出多少根筷子，才能保证摸出8双筷子(每双筷子中的两根颜色相同)．
<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<gadget id="calculator">6 + 1 + 14</gadget>
<output>21</output>

<result>21</result>