import java.awt.Point;
import java.util.ArrayDeque;
import java.util.Scanner;
import java.util.*;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;
import java.util.Collection;


 
public class Main{
	
        static final Scanner sc=new Scanner(System.in);
        
        
        
        
        
        
        public static void main(String[]args){
                int N=sc.nextInt();
                if(N>=195){
                        System.out.println(5);
                }else if(N>=189){
                        System.out.println(4);
                }
                else if(N>=165){
                        System.out.println(3);
                }
                else if(N>=135){
                        System.out.println(2);
                }else if(N>=105){
                        System.out.println(1);
                }else{
                        System.out.println(0);
                }
                
                


                
        }
        
        
        

		
	
}

/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