There are 5 red balls, 4 yellow balls and 3 blue balls of the same shape and size, and one ball is drawn out of them at a time, at least how many times, it can be guaranteed that the drawn balls have the same color.
有形状、大小相同的红色球5个、黄球4个和蓝球3个，从中一次摸出一球，至少多少次，可以保证摸出的球有颜色相同的．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<result>4</result>