There are 3 green pencils, 3 red pencils and 5 blue pencils in the box. If you close your eyes and touch once, how many times must you touch to ensure that there is at least 1 blue pencil.
盒子里有3支绿铅笔，3支红铅笔和5支蓝铅笔，如果闭上眼睛摸一次，必须摸多少次才能保证至少有1支蓝铅笔．
<gadget id="calculator">3 + 3 + 1</gadget>
<output>7</output>

<result>7</result>