Divisors

Dad, let the elephants run!

Fragment of a famous joke

Little Tanya loves the concept of division. She's fascinated by how people often discuss the divisibility of integers but overlook real numbers. In fact, a real number a can be considered divisible by another real number b if the quotient a/b results in an integer. For instance, the number 3.0 is divisible by 0.5, 1.5, and even 3.0 itself.

Your task is to help Tanya determine how many real numbers x (where 1 ≤ x ≤ n) divide n without leaving a remainder.

Input

The input consists of a single line containing an integer n (1 ≤ n ≤ 100).

Output

Output a single integer representing the count of real numbers x (where 1 ≤ x ≤ n) that divide n evenly.

Examples