i = int(input())

k = input().rstrip().split()

k.sort()

if len(k) % 2 != 0:
    a = int((len(k)-1)/2)
    print(int(k[a]))

else:
    b = int(len(k)/2)
    c = int(len(k)/2 -1)
    print((int(k[b])+int(k[c]))/2)