#include<bits/stdc++.h>
using namespace std;
int main(){
  int i,n,s=0,max=0,min=0;
  float b=0;
  int a[100]={0};
  cin>>n;
  for(i=0;i<n;i++){
  cin>>a[i];s=s+a[i];
  } 
  max=a[0];
  min=a[0];
  for(i=0;i<n;i++){
  if(a[i]>max)  max=a[i]; 
  if(a[i]<min)  min=a[i]; 
  }
  b=(s*1.0-max-min)/(n-2);
  printf("%.2f ",b);
return 0;
}
/**************************************************************
	Problem: 1168
	User: wtq001
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/