#include<iostream>
#include<algorithm>
#include<string>
using namespace std;
//typedef __int64 LL;
int main(){
    int N;
    int a[1010];
    cin>>N;
    for(int i=0;i<N;i++)cin>>a[i];
    sort(a,a+N);
    if(N%2==0)cout<<(double)((a[N/2-1]+a[N/2]))/2<<endl;
    else cout<<a[(N-1)/2]<<endl;
    return 0;
}