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# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Atc_0039
{
    class Program
    {
        static void Main(string[] args)
        {
            var S = Console.ReadLine();

            int N = int.Parse(S);

            int result = 0;

            for (int i = 1; i <= N; i++)
            {
                int cnt = 0;
                if (i % 2 == 1)
                {
                    for (int j = 1; j <= i; j++)
                    {
                        if (i % j == 0)
                        {
                            cnt++;
                        }
                    }

                    if (cnt == 8)
                    {
                        result++;
                    }
                }
            }

            Console.WriteLine(result);
        }
    }
}