use std::io::{self, Read};

#[derive(Debug)]
struct Input {
    a: Vec<i32>,
}

fn next_token(cin_lock: &mut io::StdinLock) -> String {
    cin_lock
        .by_ref()
        .bytes()
        .map(|c| c.unwrap() as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect::<String>()
}

fn read_input(cin_lock: &mut io::StdinLock) -> Input {
    let n = next_token(cin_lock).parse::<i32>().unwrap();
    let a = (0..n)
        .map(|_| next_token(cin_lock).parse::<i32>().unwrap())
        .collect();

    Input { a }
}

fn solve(input: Input, _cin_lock: &mut io::StdinLock) {
    let mut a = input.a;
    a.sort();

    let i = a.len() / 2;
    let median = if a.len() % 2 == 0 {
        // [1, 2, 3, 4] => index:[1, 2]
        (a[i - 1] + a[i]) as f32 / 2.0
    } else {
        a[i] as f32
    };

    println!("{}", median);
}

fn main() {
    let cin = io::stdin();
    let mut cin_lock = cin.lock();

    let input = read_input(&mut cin_lock);
    solve(input, &mut cin_lock);
}