#include<iostream>
#include<vector>
#include<algorithm>

int main(){
    int N;
    std::cin >> N;
    std::vector<int> x;
    for(int i=0;i<N;i++){
        int t;
        std::cin >> t;
        x.push_back(t);
    }
    std::sort(x.begin(),x.end());
    if(N%2==0){
        std::cout << static_cast<double>(x[N/2-1]+x[N/2])/2 <<std::endl;
    }
    else{
        std::cout << x[(N-1)/2] << std::endl;
    }
}