#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
    float n,m,sum=0,max=0,min=11;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>m;
        if(m>max)
        {
            max=m;
            sum+=m;
        }
        else if(m<min)
        {
            min=m;
            sum+=m;
        }
        else
        {
            sum+=m;
        }
    }
    sum=sum-max-min;
    printf("%.2f",sum/(m-2));
    return 0;
}