Problem:
Score: 200 points

Problem Statement

The number 105 is quite special - it is odd but still it has eight divisors.
Now, your task is this: how many odd numbers with exactly eight positive divisors are there between 1 and N (inclusive)?

Constraints

N is an integer between 1 and 200 (inclusive).

Input

Input is given from Standard Input in the following format:

N

Output

Print the count.

Sample Input 1

105

Sample Output 1

1

Among the numbers between 1 and 105, the only number that is odd and has exactly eight divisors is 105.

Sample Input 2

7

Sample Output 2

0

1 has one divisor. 3, 5 and 7 are all prime and have two divisors. Thus, there is no number that satisfies the condition.

Solution in Common Lisp (SBCL 1.1.14) (judge verdict: Accepted)

(defun main ()
  (count 8 (mapcar #'kn (loop :for a :from 1 :upto (read) :by 2 collect a))))
(defun kn (n)
  (loop :for k :from 1 :upto n count(= (mod n k) 0)))
(format t "~A" (main))