There are red, blue, and green glass balls in the bag, and each child touches 2 glass balls at will. How many children are needed to ensure that two or more children touch the same glass balls?
袋子中有红、蓝、绿三种玻璃球，每个小朋友任意摸2个玻璃球，那至少要几个小朋友才能保证有两个或两个以上的小朋友所摸的玻璃球的颜色相同？
<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>