# Which quarter?

Very easy

Execution time limit is 0.5 seconds

Runtime memory usage limit is 64 megabytes

It set a point with co-ordinates х and y. Define, in what co-ordinate quarter it is located.

## Input

In a unique line through a blank 2 material numbers - co-ordinates of a point are set, value of co-ordinates on the module do not exceed 100.

## Output

The singular is the number of a corresponding quarter, or 0 if unequivocally define a quarter it is impossible.

## Examples

Input #1

Answer #1

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