N=int(input())
A=[0]*N
A=list(map(int,input().split()))
c=0

for j in range(len(A)):
    for i in range(0,len(A)-1):
        if A[i] > A[i+1]:
            tmp=A[i+1]
            A[i+1]=A[i]
            A[i]=tmp

if len(A)%2==0:
    aa=A[(len(A)//2)-1]+A[(len(A)//2)]
    c=aa/2

else:
    c=A[len(A)//2]

print(c)