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 2.0.3) (judge verdict: Accepted)

(let ((n (read))
    (ans 0)
    (yakusu 0))

    (loop for i from 1 to n by 2 do
        (progn
        (setq yakusu 0)
        (loop for j from 1 while (<= (* j j) i) do
            (if (zerop (rem i j))
            (progn
                (incf yakusu)
                (if (not (= (* j j) i))
                    (incf yakusu)
                )
            )
            )
        )
        (if (= yakusu 8)
            (incf ans)
        )
        )
    )
    (princ ans )
)