There are 6 playing cards, all of which are facing up, and Xiao Ming flips 5 of them each time. So, how many times does he need to flip at least to make all 6 cards face down?
有6张扑克牌，画面都向上，小明每次翻转其中的5张．那么，要使6张牌的画面都向下，他至少需要翻动多少次？
<result>5</result>