#include<bits/stdc++.h>
using namespace std;
int main() {
    int n ;
    while(cin >> n) {
        int *a = new int[n];
        for(int i = 0; i < n; i++) {
            cin >> a[i];
        }
        sort(a, a + n);
        double s = 0;
        for(int i = 1; i <= n - 2; i++) {
            s += a[i];
        }
        cout << fixed << setprecision(2) << s / (n - 2) << endl;
        delete[]a;
    }
    return 0;
}