#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,x,sum,minn=10,maxn=0;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>x;
		sum+=x;
		if(x<minn) minn=x;
		if(x>maxn) maxn=x;
	}
	printf("%.2f",(sum-maxn-minn)*1.0/(n-2));
	return 0;
}