#include <bits/stdc++.h>
using namespace std;
int main(){
    int a[150]={0},n,i,j=0,ls=1,b;
    float p,l;
    cin>>n;
    for(i=0;i<n;i++){
    	cin>>a[i];
    }
    for(ls=1;ls<n;ls++){
    	for(i=0;i<n-ls;i++){
    		if(a[i]<a[i+1]){
    			swap(a[i],a[i+1]);
    		}
    	}
    }
    if(n%2==1){
		p=a[n/2]*1.0;
		printf("%.1f",p);	
    }else{
    j=n/2-1;
    b=n/2;
    p=(a[j]+a[b])/2.0;
    printf("%.1f",p);
    }

}

/**************************************************************
	Problem: 1233
	User: wngjinming
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2076 kb
****************************************************************/