# A*B*C

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

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 $k(1≤k≤2⋅10_{5})$.

## Output

Print the number of triples of positive integers $(a,b,c)$ such that $a⋅b⋅c≤k$.

## Examples

Input #1

Answer #1

Input #2

Answer #2

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