#include <bits/stdc++.h>
int main(void) {
  long long int n, x, y;
  scanf("%lld", &n);
  scanf("%lld %lld", &x, &y);
  if ((2 * n - x - y) >= (x + y - 2)) {
    printf("white\n");
  } else {
    printf("black\n");
  }
}
