#include <iostream>
#include<stdio.h>
int main() {
    int n,x,y,a[100000],i;
    double s=0,t;
    scanf("%d",&n);
    for (i=1; i<=n; i++) 
    scanf("%d",&a[i]);
     for (i=1; i<=n; i++) 
     { if(a[1]>a[i])
        {
            x=a[1];
            a[1]=a[i];
            a[i]=x;
        }
      }
      for (i=2; i<=n; i++) 
     { if(a[2]<a[i])
        {
            y=a[2];
            a[2]=a[i];
            a[2]=y;
        }
      }
      for (i=3; i<=n; i++) 
      s=s+a[i];
       t=s/(n-2);
       printf("%.2lf",t);
       return 0;
}