#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n, a, b, x, y, x1, y1;
  cin >> n >> a >> b;
  if (max(n - a, n - b) < max(a - 1, b - 1))
    cout << "black\n";
  else
    cout << "white\n";
  return 0;
}
