import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int num = sc.nextInt();
            int a[] = new int[num];
            for (int i = 0; i < a.length; i++) {
                a[i] = sc.nextInt();
            }
            int max = a[0];
            for (int j = 0; j < a.length; j++) {
                if (max < a[j]) {
                    max = a[j];

                }
            }
            int min = a[0];
            for (int k = 0; k < a.length; k++) {
                if (min > a[k]) {
                    min = a[k];
                }
            }
            double sum = 0;
            for (int i = 0; i < a.length; i++) {
                sum = sum + a[i];
            }
            System.out.printf("%.2f", (sum - (max + min)) / (num - 2));
            System.out.println();
        }
    }

}