#include <cstdio>
#include <algorithm>
long double a[1005], ans;
int main()
{
    int n;
    scanf("%d", &n);
    for (int i = 0; i < n; i++)
        scanf("%lf", &a[i]);
    std::stable_sort(a, a + n);
    for (int i = 1; i < n - 1; i++)
        ans += a[i];
    printf("%.2lf", ans / n);
    return 0;
}