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 (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <math.h>

int main(void)
{
  int n,i,j,k,count=0;
  
  scanf("%d",&n);
  
  for(i = 1; i <= n;i+=2){
    double sqr = sqrt(i);
    k=0;
	for(j = 1; j <= sqr; j++)
		if(!(i%j))
			k++;
    if(k == 4){
      count ++;
    }
  }
  printf("%d\n",count);

  return(0);
}