There are 8 blue balls, 14 yellow balls, and 10 white balls of the same shape and size in the pocket. How many balls we draw can guarantee that there must be a yellow ball among them.
在口袋里有同样形状和大小的蓝球8个，黄球14个，白球10个，我们摸出多少个球能保证其中一定有一个黄球．
<gadget id="calculator">8 + 10 + 1</gadget>
<output>19</output>

<result>19</result>