# include <iostream>
# include <cstdio>
# include <algorithm>
using namespace std;

int main()
{
    int n;
    int a[1010];
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
    sort (a + 1, a + n + 1);
    int sum = 0;
    for (int i = 2; i <= n - 1; i++)
    {
        sum += a[i];
    }
    printf("%.2f", sum / (n - 2));
    return 0;
}

零分，还报零