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: Runtime Error)

class Integer
    def yakusuu
        list = Array.new
        n = self.clone
        i = 2
        while n > 1 do
            if n % i == 0
                list << i
                n /= i
            else
                i += 1
            end
        end
        list
    end
end

def check(n)
    if n.yakusuu.size == 3 && n.yakusuu.uniq.size == 3
        @count += 1
    elsif n.yakusuu.size == 4 && n.yakusuu.uniq.size == 2
        @count += 1
    end
end

N = gets.to_i
@count = 0
(1..N).each do |n|
    next if n % 2 == 0
    check(n)
end
puts @count