import java.util.*;
public class Main{
        public static void main(String[] args){
                Scanner sc = new Scanner(System.in);
                int n = sc.nextInt();
                int yono = 0;
                if(n >= 165) yono++;
                if(n >= 105) yono++;
                if(n >= 195) yono++;
                if(n >= 135) yono++;
                if(n >= 189) yono++;
                sc.close();
                System.out.println(yono);
        }
}
/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