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

for i in range(int(N)):
    min=A[i]
    min_number=i
    flag=True
    for j in range(i+1,int(N)):
        if min>A[j]:
            min=A[j]
            min_number=j
            flag=False
    if flag==True:
        break
    work=A[i]
    A[i]=A[min_number]
    A[min_number]=work

if int(N)%2!=0:
    print(A[int(N)//2])
else:
    print("{0}".format((int(A[int(N)//2-1])+int(A[int(N)//2]))/2))