#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    int a[500];
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
   }
    double  min = 100;
    double  max = -1;
    double sum = 0;
    for (int i = 1; i <= n; i++)
    {
        if (a[i]< min)
        {
            min = a[i];
        }
        if (a[i] > max)
        {
            max = a[i];
        }
        sum += a[i];
    }
    cout << fixed << setprecision(2) << (sum - max - min) / (n - 2) << endl;
        return 0;
}```