hdu 2014

#include<iostream>
#include<stdio.h>
#include<math.h>
#include<queue>
#include<stack>
#include<algorithm>
#define PI 3.1415927
using namespace std;
int main()
{
    int i;
    int n,a[105];
    while(~scanf("%d",&n))
    {
        double sum=0;
        for(i=0;i<n;i++)
        {
            scanf("%d",&a[i]);
        }
        sort(a,a+n);
        for(i=1;i<n-1;i++)
        {
            sum+=a[i];
            ///printf("%d\n",a[i]);
        }
        printf("%.2lf\n",sum/(n-2));
    }
    return 0;
}
///hdu2014