#include<bits/stdc++.h>
using namespace std;
int main() {
int a[1000],b,c=0,f=1000000,g=-10000000;
cin>>b;
for(int i=1;i<=5;i++){
	cin>>a[i];
	if(a[i]<f){
		f=a[i];
	}if(a[i]>g){
		g=a[i];
	}
	c+=a[i];
}
printf("%.2lf",(c-f-g)*1.0/(b-2));
}