n = int(input())
a = list(map(int, input().split()))

xor = 0

for i in range(2, n + 1):
    ai = a[i-1]
    if ai == 0:
        continue
    lsb = i & -i
    k = lsb.bit_length() - 1
    mod = k + 1
    gr = ai % mod
    xor ^= gr

print("Alice" if xor != 0 else "Bob")