There are enough footballs, basketballs and volleyballs on the playing field. The teacher arranged for 66 students to send these balls back to the sports equipment room, requiring each person to move 1 or 2 balls. Ask at least how many students move the same type and quantity of balls?
运动场上有足够多的足球、篮球和排球．老师安排66名同学将这些球送回体育器材室，要求每人必须搬1个或2个球．问至少有多少名同学所搬的球的种类和数量是一样的？
<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<result>8</result>