import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author mikit
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B105 solver = new B105();
        solver.solve(1, in, out);
        out.close();
    }

    static class B105 {
        private static final int[] SPECIAL_NUMBERS = {105, 135, 165, 189, 195};

        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = in.nextInt();
            int ans = 0;
            for (int s : SPECIAL_NUMBERS) {
                if (s <= n) {
                    ans++;
                }
            }
            out.println(ans);
        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B105 solver = new B105();
        solver.solve(1, in, out);
        out.close();
    }

    static class B105 {
        private static final int[] SPECIAL_NUMBERS = {105, 135, 165, 189, 195};

        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = in.nextInt();
            int ans = 0;
            for (int s : SPECIAL_NUMBERS) {
                if (s <= n) {
                    ans++;
                }
            }
            out.println(ans);
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B105 solver = new B105();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B105 solver = new B105();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) B105 solver = new B105(); solver new B105() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class B105 {
        private static final int[] SPECIAL_NUMBERS = {105, 135, 165, 189, 195};

        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = in.nextInt();
            int ans = 0;
            for (int s : SPECIAL_NUMBERS) {
                if (s <= n) {
                    ans++;
                }
            }
            out.println(ans);
        }

    } B105 private static final int[] SPECIAL_NUMBERS = {105, 135, 165, 189, 195}; SPECIAL_NUMBERS {105, 135, 165, 189, 195} 105 135 165 189 195 public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = in.nextInt();
            int ans = 0;
            for (int s : SPECIAL_NUMBERS) {
                if (s <= n) {
                    ans++;
                }
            }
            out.println(ans);
        } solve {
            int n = in.nextInt();
            int ans = 0;
            for (int s : SPECIAL_NUMBERS) {
                if (s <= n) {
                    ans++;
                }
            }
            out.println(ans);
        } int n = in.nextInt(); n in.nextInt() in.nextInt in int ans = 0; ans 0 for (int s : SPECIAL_NUMBERS) {
                if (s <= n) {
                    ans++;
                }
            } int s SPECIAL_NUMBERS {
                if (s <= n) {
                    ans++;
                }
            } {
                if (s <= n) {
                    ans++;
                }
            } if (s <= n) {
                    ans++;
                } s <= n s n {
                    ans++;
                } ans++ ans out.println(ans) out.println out ans int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B105 solver = new B105();
        solver.solve(1, in, out);
        out.close();
    }

    static class B105 {
        private static final int[] SPECIAL_NUMBERS = {105, 135, 165, 189, 195};

        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = in.nextInt();
            int ans = 0;
            for (int s : SPECIAL_NUMBERS) {
                if (s <= n) {
                    ans++;
                }
            }
            out.println(ans);
        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B105 solver = new B105();
        solver.solve(1, in, out);
        out.close();
    }

    static class B105 {
        private static final int[] SPECIAL_NUMBERS = {105, 135, 165, 189, 195};

        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = in.nextInt();
            int ans = 0;
            for (int s : SPECIAL_NUMBERS) {
                if (s <= n) {
                    ans++;
                }
            }
            out.println(ans);
        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author mikit
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B105 solver = new B105();
        solver.solve(1, in, out);
        out.close();
    }

    static class B105 {
        private static final int[] SPECIAL_NUMBERS = {105, 135, 165, 189, 195};

        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = in.nextInt();
            int ans = 0;
            for (int s : SPECIAL_NUMBERS) {
                if (s <= n) {
                    ans++;
                }
            }
            out.println(ans);
        }

    }
}

