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 C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;

int yakusuu(int n) {
  int ans = 0;
  for (int i = 1; i * i <= n; i++) {
    if (n % i == 0) ans += 2;
    
    if (n / i == i) ans++;
  }
  
  return ans;
}

  
int main() {
  int N;
  cin >> N;
  
  int ans = 0;
  for (int i = 1; 2 * i - 1<= N; i++) {
    if (yakusuu(2 * i - 1) == 8) {
      ans++;
    }
  }
  
  cout << ans << endl;
  
  
}