#!/usr/bin/env python3
# -*- coding: utf-8-*-
if __name__ == '__main__':
    n = int(input())
    l = list(map(int, input().split(" ")))
    l.sort()
    if n % 2 == 0:
        a = (l[n//2-1] + l[n//2])/2
    else:
        a = l[(n-1)//2]
    print(a)