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.
One integer k (1≤k≤2⋅105).
Print the number of triples of positive integers (a,b,c) such that a⋅b⋅c≤k.