There are 38 small balls of the same size and weight but different colors in the pocket. There are 12 red balls, 13 yellow balls, 7 white balls and 6 black balls. If you close your eyes and take balls from your pocket, how many balls should you take out at least to ensure that 5 of them are of the same color.
口袋里装有38个大小重量相同而颜色不同的小球．分别是红球12个，黄球13个，白球7个，黑球6个．如果闭上眼睛从口袋里取球，至少取出多少个才能保证其中有5个小球是颜色相同的．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<result>17</result>