You have two positive integers w and h. Your task is to count the number of rhombi which have the following properties:
Count the number of such rhombi.
Let us remind you that a rhombus is a quadrilateral whose four sides all have the same length.
2 2 1 2
1 0
In the first example there exists only one such rhombus. Its vertices are located at points (1, 0), (2, 1), (1, 2), (0, 1).
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