import numpy as np # From: http://stackoverflow.com/a/35178910 def angle(x, y): a = np.array([50, 100, 0]) b = np.array([50, 50, 0]) c = np.array([x, y, 0]) ba = a - b bc = c - b cosine_angle = np.dot(ba, bc) / (np.linalg.norm(ba) * np.linalg.norm(bc)) angle = np.arccos(cosine_angle) return np.degrees(angle) def solve(S): p, x, y = S #print("p={0}, x={1}, y={2}".format(p, x, y)) dist=np.sqrt((x-50)*(x-50)+(y-50)*(y-50)) if dist > 50: return 'white' a=angle(x,y) if x < 50: a=360-a #print('Angle={0}'.format(a)) if p >= 100*a/360: return 'black' return 'white' if __name__ == "__main__": import fileinput f = fileinput.input() T = int(f.readline()) for case in range(1, T+1): S = [int(i) for i in f.readline().split()] solution = solve(S) print("Case #{0}: {1}".format(case, solution))