1 #include<iostream>
 2 #include<cstdio>
 3 using namespace std;
 4 int main()
 5 {
 6     int n,count;
 7     double a,min,max,sum,aver;
 8     while(cin>>n&&n)
 9     {
10         max=0,min=101,sum=0,count=n;
11         while(n--)
12         {
13             cin>>a;
14             if(a>max)max=a;
15             if(a<min)min=a;
16             sum+=a;
17         }
18         aver=(sum-max-min)/(count-2);
19         printf("%.2lf\n",aver);
20     }
21     return 0;
22 }