#中央値を求めよ

N = int(input())
A = input().split(" " )

A = list(map(int,A))
A.sort()

if N % 2 == 0:
    k = int(N/2)
    print((int(A[k]) + int(A[k-1])) / 2)
else:
    print(A[int((N-1) / 2)])