A*B*C
Very easy
Execution time limit is 1 second
Runtime memory usage limit is 128 megabytes
Given a positive integer , find the number of triples of positive integers such that . Two triples that only differ in the order of numbers are also distinguished.
Input
One integer .
Output
Print the number of triples of positive integers such that .
Examples
Input #1
Answer #1
Input #2
Answer #2
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