#include <vector>
#include <iostream>
using namespace std;

int main() {
	int N;
	cin >> N;
	vector<int> A(N + 1);
	for (int i = 1; i <= N; i++) {
		cin >> A[i];
	}
	int parity = 0;
	for (int i = 1; i <= N; i++) {
		if (i % 2 == 0 && A[i] % 2 == 1) {
			parity ^= 1;
		}
	}
	bool cond = true;
	for (int i = 2; i <= N; i += 2) {
		if (A[i] >= 2) {
			cond = false;
		}
	}
	cout << (parity == 0 && cond ? "Bob" : "Alice") << endl;
	return 0;
}