#include<cstdio>
#include<algorithm>
using namespace std;
int main()
{
	int n,sum=0;
	scanf("%d",&n);
	int p[n];
	for(int i=0;i<=n-1;i++)scanf("%d",&p[i]);
	sort(p,p+n);
	for(int i=1;i<=n-2;i++)sum=sum+p[i];
	double point=sum/(n-2);
	printf("%.2f",point);
	return 0;
 }