import java.util.Scanner;

public class Main {
	  
	public static void main(String args[]) {
		    Scanner scanner = new Scanner(System.in);
		   
			int N = scanner.nextInt();
			int count = 0;
			
			
			if( N >= 105 ) 
			{
				count++;
			}
			if( N >= 135 ) 
			{
				count++;
			}
			if( N >= 165 ) 
			{
				count++;
			}
			if( N >= 189 ) 
			{
				count++;
			}
			if( N >= 195 ) 
			{
				count++;
			}
			
			System.out.println(count);
			
		    scanner.close(); }
		  }
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz