There are 8 white balls, 5 yellow balls and 15 black balls of the same size in a pocket. Close your eyes and touch the ball from your pocket. How many balls should you take out at least to ensure that there are black balls among the drawn balls?
口袋里有同样大小的8个白球、5个黄球和15个黑球．闭上眼睛从口袋中摸球，至少取出多少个球，才能保证摸出的这几个球中有黑球？
<gadget id="calculator">5 + 8 + 1</gadget>
<output>14</output>

<result>14</result>