import math

number = int(input())
org_list = list(map(int, input().split()))
org_list = sorted(org_list)

if number %2 == 0 :
  c_index1 = math.floor((number / 2) - 1)
  c_index2 = math.floor(c_index1 + 1)
  ans = (org_list[c_index1] + org_list[c_index2]) / 2
else :
  c_index = (math.ceil(number / 2)) -1
  ans = org_list[c_index]

print (ans)