#include <bits/stdc++.h>
using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int>A(N);
    for(int i = 0; i < N; i++) {
        cin >> A[i];
    }
    if(A[N-1] != 1) {
        cout << "Alice" << endl;
    }
    else {
        bool flag = false;
        for(int i = 0; i < N; i++) {
            if(A[i] != 1) {
                flag = true;
            }
        }
        if(!flag && N%2) {
            cout << "Alice" << endl;
        }
        else {
            cout << "Bob" << endl;
        }
    }
}