There are 3 red balls, 4 white balls and 5 blue balls in the box, how many balls are drawn from the box to ensure that there is at least one ball of each color.
箱子中有3个红球，4个白球和5个蓝球，从中摸出多少球，才能保证每种颜色的球至少有一个．
<gadget id="calculator">4 + 5 + 1</gadget>
<output>10</output>

<result>10</result>