#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n,j,i,a[100];
	cin>>n;
	float d;
	for(i=0;i<n;i++)
	{
		cin>>a[i];
	}
	for(i=0;i<=n-2;i++)
	{
		for(j=i+1;j<=n-1;j++)
		if(a[i]>a[j]) swap(a[i],a[j]);
	}
	if(n%2==0) d=(a[n/2]+a[n/2-1]*1.0)/2;
	else d=a[n/2];
	printf("%.1f",d);
	
	
	
	
	
	return 0;
}

/**************************************************************
	Problem: 1233
	User: 21A
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/