#include <bits/stdc++.h>

using namespace std;

int main() {
    //cin读入优化
    std::ios::sync_with_stdio(false);
    int n;
    cin >> n;

    if (1.0 * n / 1.2 > 1.0 * n / 3.0 + 27 + 23) {
        cout << "Bike";
    } else {
        cout << "Walk";
    }
    return 0;
}