It set a point with co-ordinates \textbf{х} and \textbf{y}. Define, in what co-ordinate quarter it is located. \InputFile In a unique line through a blank \textbf{2} material numbers - co-ordinates of a point are set, value of co-ordinates on the module do not exceed \textbf{100}. \OutputFile The singular is the number of a corresponding quarter, or \textbf{0} if unequivocally define a quarter it is impossible.