import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Arrays;

public class GetMed{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        double[] A = new double[N];
        for(int i=0; i<N; i++){
            A[i] = sc.nextDouble();
        }
        Arrays.sort(A);
        if(N%2 == 0){
            System.out.println((A[N/2-1]+A[N/2])/2);
        }else{
            System.out.println(A[(N-1)/2]);
        }
    }
}