Xiao Wang has 5 blue balls, 3 red balls, and 7 yellow balls in his pocket, so how many balls should be taken at least to ensure that all three colors of balls are taken.
小王口袋里有5个蓝球，3个红球，7个黄球，那么至少取多少个球，才能保证三种颜色的球都取到．
<gadget id="calculator">5 + 7 + 1</gadget>
<output>13</output>

<result>13</result>