Given a positive integer k, find the number of triples of positive integers (a,b,c) such that a⋅b⋅c≤k. Two triples that only differ in the order of numbers are also distinguished.
Input
One integer k(1≤k≤2⋅105).
Output
Print the number of triples of positive integers (a,b,c) such that a⋅b⋅c≤k.