a=int(input())
y=input()
scores = y.split(" ")[:a]
scores.sort()
if a>=3:
	del scores[a-1]
	del scores[0]
sum=0
for score in scores:
	score=int(score)
	sum=sum+score
fina_score=sum/(a-2)
print("%.2f"%fina_score)

总是只能过两个呜呜呜，求大佬教教