N = int(input())
A = list(map(int,input().split()))

if N == 1:
    print("Alice")
elif N == 2:
    if A[1] == 1:
        print("Bob")
    else:
        print("Alice")
else:
    if A[1] == 1:
        if A[2] > 1:
            print("Alice")
        else:
            print("Bob")
    elif A[1] > 1:
        if A[2] == 1:
            print("Bob")
        else:
            print("Alice")