#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n,ans;
    cin>>n;
    int a[n];
    for(int i=0;i<n;i++)cin>>a[i];
    sort(a,a+n);
    if(n%2==0)cout<<(a[n/2]+a[(n/2)-1])/2.0<<endl;
    else cout<<a[(n-1)/2]<<endl;
    return 0;
}