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 Perl (v5.18.2) (judge verdict: Accepted)

chomp (my $n = <STDIN>);

my $ans = 0;
for my $i (1..$n) {
  my $c = 0;
  for my $j (1..$i) {
    $c++ if $i % (2 * $j - 1) == 0;
  }
  $ans++ if $c == 8;
}
print "$ans\n";