p5726

#include<bits/stdc++.h>
using namespace std;
int main()
{
    double n;
    cin>>n;
    double c=11;
    double e=0;
    double b;
    double d=0;
    if(n<=0)
    {
        cout<<fixed<<setprecision(2)<<n<<endl;
        return 0;
    }
    for(int a=1;a<=n;a++)
    {
        cin>>b;
        d=d+b;
        if(b<=c)
        {
            c=b;
        }
        else
        {
            c=c;
        }
        if(b>=e)
        {
            e=b;
        }
        else
        {
            e=e;
        }
     } 
     d=(d-e-c)/(n-2);
     cout<<fixed<<setprecision(2)<<d<<endl;
    return 0;
 }
 //欢迎找错