#include <stdio.h>
int main() {
    int n,a[1000],b=0,c=0;
    double d = 0;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf("%d",&a[i]);
        if (b < a[i]) {
            b = a[i];
        }
        if (c > a[i]) {
            c = a[i];
        }
        d = d + a[i];
    }
    d = (d - c - b)/ (n - 2);
    printf("%.2lf", d);
    return 0;
}