#include <bits/stdc++.h>
using namespace std;
int main(){
	int n,j,i;
	cin>>n;
	int a[200];
	float b;
    for(i=0;i<n;i++)
	{
		cin>>a[i];
    }
    for(i=0;i<n-1;i++)
	{
		for(j=i+1;j<=n-1;j++)
		if(a[i]>a[j]) swap(a[i],a[j]);
	}
	if(n%2==0) b=(a[n/2]+a[n/2-1])*1.0/2;
	else b=a[n/2];
	printf( "%.1f",b);
	return 0;
	}

/**************************************************************
	Problem: 1233
	User: ljl2
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2076 kb
****************************************************************/