#include <bits/stdc++.h>

 using namespace std;

 int main()

 {

     //freopen("input.txt", "r", stdin);

     int n;

     while(~scanf("%d",&n))

     {

         if(n==)

         {

             cout<<"0.00"<<endl;

             continue;

         }

         double small, big;

         cin>>small>>big;

         if(small>big)   swap(small,big);

         double ans=0.0, tmp=0.01;

         for(int i=; i<n-; i++)

         {

             cin>>tmp;

             if(tmp<small)

             {

                 ans+=small;

                 small=tmp;

             }

             else if(tmp>big)

             {

                 ans+=big;

                 big=tmp;

             }

             else    ans+=tmp;

         }

         printf("%.2f\n",ans/(n-));

     }

     return ;

 }