import java.util.*;

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

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
			//105 135 165 195
			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);
	}
}
