#include<iostream>
using namespace std;
int main()
{
	int x,maxn,minn,i;
	double s,n,ans;
	cin>>n;
	s=ans=0;
	for(i=1;i<=n;i++)
	{
		cin>>x;
	    if(i==1)	maxn=minn=x;
		if(x>maxn)maxn=x;
		if(minn>x)minn=x;
		s+=x;
	}
	ans=(s-maxn-minn)/(n*1.0);
	printf("%.2f",ans);
	return 0;
}