n=int(input())
l1=list(map(int,input().split()))
a=max(l1)
b=min(l1)
l1.remove(max(l1))
l1.remove(min(l1))
s=0
for i in l1:
    s+=i
c=s/(n-2)
print('%.2f'% c)
/**************************************************************
	Problem: 1168
	User: admin
	Language: Python
	Result: Accepted
	Time:88 ms
	Memory:34480 kb
****************************************************************/