N = int(input())
l = list(map(int, input().split()))
median = 0
l1 = sorted(l)
#print(type(l1[1]))

if N % 2 == 0:
    k = int(N / 2)
    median = (l1[k] + l1[k-1]) / 2
else:
    k = int(N /2)
    median = l1[k]

print (median)