class Vector4d:
	def __init__(self, x, y, z, w):
		self.x = x
		self.y = y
		self.z = z
		self.w = w
		
class Vector3d:
	def __init__(self, x, y, z):
		self.x = x
		self.y = y
		self.z = z
		
class Vector2d:
	def __init__(self, x, y):
		self.x = x
		self.y = y