#include<iostream>
using namespace std;

int main() {
    int n;
    while (cin >> n) {
        int temp, max = -1, min = 110;
        double avg = 0;
        for (int i = 0;i < n;i++) {
            cin >> temp;
            avg += temp;
            if (temp < min) {
                min 
 
= temp;
            }
            if (temp > max) {
                max = temp;
            }
        }
        avg = avg - max - min;
        printf("%.2f\n", avg / (n - 2));
    }
    return 0;
}

HDOJ 2014 青年歌手大獎賽_評委會打分