import math
n=int(input())
numlist=sorted(list(map(int,input.split())))
length=len(numlist)
if length%2==0:
   low=math.floor(legth/2)-1
   high=low+1
   mid=(numlist[low]+numlist[high])/2
else:
   mid=(numlist[math.ceil(length/2)-1])
print(mid)