There are 15 red, yellow, and white beads in the bag. If you close your eyes and want to find 5 beads of the same color, at least how many beads must be found to ensure that the goal is achieved.
袋子里有红、黄、白珠子各15个闭上眼睛要想摸出颜色相同的5粒珠子，至少要摸出多少粒珠子，才能保证达到目的．
<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<result>13</result>