There are 10 red, yellow, blue and white beads each, packed in a bag, in order to ensure that there are two beads of the same color, how many beads should be drawn at least?
有红、黄、蓝、白珠子各10粒，装在一只袋子里，为了保证摸出的珠子有两粒颜色相同，应至少摸出几粒？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>