use proconio::input;

fn main() {
    input! {
        n: usize,
        mut a: [i32; n],
    }
    a.sort_unstable();
    if n % 2 == 0 {
        let ans = (a[n / 2 - 1] + a[n / 2]) as f64 / 2.0;
        println!("{}", ans);
    } else {
        println!("{}", a[n / 2]);
    }
}