#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    cin >> n;

    float a = n / 1.2;
    float b = n / 3.0 + 27 + 23;

    if (a > b)
        cout << "Bike" << endl;
    else
        cout << "Walk" << endl;
    return 0;
}