n = int(input())
a = list(map(int,input().split()))
c = a[1] + a[2]*2
cnt = 0
for i in range(3,n):
  cnt += a[i]
if c % 2 == 1:
  if cnt > 0:
    print("Bob")
  else:
    print("Alice")
else:
  if cnt > 0:
    print("Alice")
  else:
   print("Bob")