Strange number
Once a financier pondered the following question - is it possible with negative totals for each interval of one month and the same length of some of the reporting period, however, the sum total of the same period a positive indicator.
Our task - to help him in this. Required to write a program that for a given positive integer N determines the total number of numbers that have the above property for a period of length N. Ie for given N to find the number of integers n for each of them, you can create a sequence of length N, the sum of whose members is positive, but each segment of length n in the sum gives a negative number.
Input
The only line of input contains integer N (1 ≤ N ≤ 2·10^10).
Output
The output file a single number - the answer of the problem.