#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,m;int s[1005] = {0};
	cin >> n;
	if(n == 0) {
	cout << 0<<endl;goto returnhere;}
	
	for(int i = 0;i<n;++i){
		cin >> s[i];
	}
	sort(s,s+n);
	for(int i = 0;i < n;i++){
		m += s[i];
	}
	m = m - s[n - 1] - s[0];
	cout <<fixed<<setprecision(2)<<m/double(n-2) <<endl;
	returnhere:
	return 0;
}