import java.util.*;
public class Main{
 public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
   int N = sc.nextInt();

   if(N<105) System.out.println(0);
   else if(N<135) System.out.println(1);
   else if(N<165) System.out.println(2);
   else if(N<189) System.out.println(3);
   else if(N<195) System.out.println(4);
   else System.out.println(5);
 }
}
/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