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 Ruby (2.3.3) (judge verdict: Accepted)

n=gets.to_i
odd=Array.new
for i in 1..n
    if(i%2!=0)
        odd.push(i)
    end
end
ret=0
require 'prime'
odd.each{|i|
    cnt=1
    insu=Prime.prime_division(i)
    a=insu.map{|soi|soi[1]+1}
    a.each{|j|
        cnt*=j
    }
    if cnt==8 then ret+=1 end
}
p ret