There are 3 red balls, 4 white balls and 5 blue balls in a box, all of which are identical except for their colors. How many balls can be drawn from it 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，除颜色不同其他都完全相同．从中摸出多少个球，才能保证每种颜色的球至少有1个．
<gadget id="calculator">4 + 5 + 1</gadget>
<output>10</output>

<result>10</result>