#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[1000],n,i,j;
	float h=0;
	cin>>n;
	for(i=0;i<n;i++){
		cin>>a[i];
	}
	for(i=n-1;i>0;i--){	
		for(j=0;j<i;j++){
			if(a[j]<a[j+1]){
				swap(a[j],a[j+1]);
			}
		}
	}
	
	if(n%2==0){	
		h=(a[n/2]+a[n/2-1])/2.0;
	}else
		h=a[n/2];
	printf("%.1f",h);
	return 0;
}

/**************************************************************
	Problem: 1233
	User: cyp
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/