#include<bits/stdc++.h>
using namespace std;
int main()
{
	int i,m,n,a[10],p,x=0,b;
	cin>>n;
	for(i=0;i<n;i++){
		cin>>a[i];
		x+=a[i];
	}
	for(i=0;i<n-1;i++){
		for(p=0;p<n-i-1;p++){
			if(a[p]<a[p+1])
			swap(a[p],a[p+1]); 
		}
	}
	if(n%2==0)
	printf("%.1f",(a[n/2-1]+a[n/2])/2.0);
	else
	printf("%.1f",a[n/2]*1.0);
	return 0;
}
/**************************************************************
	Problem: 1233
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/