#include <bits/stdc++.h>
using namespace std;


signed main(){
    int n;cin>>n;
    vector<int>v(n);
    for(int i=0;i<n;i++)cin>>v[i];
    sort(v.begin(),v.end());
    double ans=0;
    for(int i=1;i<n-1;i++)ans+=v[i];
    ans/=n;
    cout<<fixed<<setprecision(2)<<ans<<endl;
}