#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
    int N;
    cin>>N;
    vector<int> S(N);
    for(int i=0;i<N;i++) cin>>S[i];
    sort(S.begin(),S.end());
    if(N%2) cout<<S[N/2]<<endl;
    else cout<<(S[N/2]+S[N/2-1]*1.0)/2<<endl;
}