Given a positive integer, , find and print the number of pairs of positive integers (a,b), where a<b, that exist such that the equation x. a + y. b = n (where x and y are positive integers) has at least one solution.
A single positive integer denoting n .
Print a single integer denoting the number of such pairs.
Sample Input 0
Sample Output 0
There are two such (a,b ) pairs: (1,2) and (1,3).
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