Sum of Factors

Given a positive integer (n), compute the sum of all positive divisors of (n). The divisors include both 1 and (n) itself. The result is defined by the formula: (S(n) = \sum_{d|n} d). Your task is to read an integer from standard input and print the sum of its divisors to standard output.

inputFormat

Input Format: A single line containing a positive integer (n).

outputFormat

Output Format: A single integer representing the sum of all the positive divisors of (n).## sample

6

12