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: Wrong Answer)

n = $stdin.read.to_i
a = (1..100).map{|i| i * 2 - 1 }
res = 0
a.each do |i|
  cnt = 0
  a.each do |k|
    cnt += 1 if i % k == 0
    break if i < k
  end
  res += 1 if cnt == 8
  break if i == n
end
puts res