# -*- coding: utf-8 -*-
n = int(input())
a = list(map(int, input().split()))
a.sort()
median = 0

while len(a) > 2:
    del a[0]
    del a[-1]
    print(a)

if len(a) == 2:
    calc = (a[0] + a[1]) / 2
    median = round(calc, 1)
else:
    median = a[0]

print(median)