#include<stdio.h>
int main()
{
	int n;
	scanf("%d",&n);
	int i,k,t,j,a[n];
	double s;
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
	}
	for(i=0;i<n-1;i++){
		k=i;
		for(j=i+1;j<n;j++){
			if(a[j]<a[k]){
				k=j;
			}
			if(k!=i){
				t=a[i];
				a[i]=a[k];
				a[k]=t;
			}
		}
	}
	for(i=1;i<n-1;i++){
		s+=a[i];
	}
	printf("%.2f",s/(n-2));
	return 0;
} 
/**************************************************************
	Problem: 1168
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1144 kb
****************************************************************/