n = int(input())
m = list(map(int,input().split()))
m.sort()
if n % 2 == 0:
    if (m[n//2]+m[n//2-1])%2==0:
        print(int((m[n//2]+m[n//2-1])/2))
    else:
        print((m[n//2]+m[n//2-1])/2)
else:
    print(m[n//2])