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