from math import gcd
N = int(input())
li = tuple(tuple(map(int, input().split())) for a in range(N))
cnt = 0
for i in range(N - 1):
    for j in range(i + 1, N):
        if gcd(abs(li[i][0] - li[j][0]), abs(li[i][1] - li[j][1])) != 1:
            cnt += 1
            break
print("Bob" if cnt % 2 == 0 else "Alice")