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