import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);

        int n = stdIn.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);
        }
    }
} import java.util.Scanner; Scanner java.util public class Main{
    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);

        int n = stdIn.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);
        }
    }
} Main public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);

        int n = stdIn.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);
        }
    } main {
        Scanner stdIn = new Scanner(System.in);

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

        int n = stdIn.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);
        }
    }
} public class Main{
    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);

        int n = stdIn.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);
        }
    }
} Main
import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);

        int n = stdIn.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);
        }
    }
}