IT City company developing computer games decided to upgrade its way to reward its employees. Now it looks the following way. After a new game release users start buying it actively, and the company tracks the number of sales with precision to each transaction. Every time when the next number of sales is not divisible by any number from 2 to 10 every developer of this game gets a small bonus.

A game designer Petya knows that the company is just about to release a new game that was partly developed by him. On the basis of his experience he predicts that n people will buy the game during the first month. Now Petya wants to determine how many times he will get the bonus. Help him to know it.

Input

The only line of the input contains one integer n (1 ≤ n ≤ 1018) — the prediction on the number of people who will buy the game.

Output

Output one integer showing how many numbers from 1 to n are not divisible by any number from 2 to 10.

Examples

Input

12


Output

2
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Egor Kulikov (egor@egork.net)
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        OutputWriter out = new OutputWriter(outputStream);
        TaskK solver = new TaskK();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskK {
        public void solve(int testNumber, InputReader in, OutputWriter out) {
            long n = in.readLong();
            long x = 1;
            for (int i = 2; i <= 10; i++) {
                x = IntegerUtils.lcm(i, x);
            }
            long phi = MultiplicativeFunction.PHI.calculate(x);
            long answer = (n / x) * phi;
            for (long i = (n / x) * x; i <= n; i++) {
                if (IntegerUtils.gcd(i, x) == 1) {
                    answer++;
                }
            }
            out.printLine(answer);
        }

    }

    static class OutputWriter {
        private final PrintWriter writer;

        public OutputWriter(OutputStream outputStream) {
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
        }

        public OutputWriter(Writer writer) {
            this.writer = new PrintWriter(writer);
        }

        public void close() {
            writer.close();
        }

        public void printLine(long i) {
            writer.println(i);
        }

    }

    static abstract class MultiplicativeFunction {
        public static final MultiplicativeFunction PHI = new MultiplicativeFunction() {

            protected long value(long p, int exponent, long power) {
                return power / p * (p - 1);
            }
        };

        protected abstract long value(long p, int exponent, long power);

        public long calculate(long argument) {
            long value = 1;
            for (long i = 2; i * i <= argument; i++) {
                if (argument % i == 0) {
                    int exponent = 0;
                    long power = 1;
                    do {
                        exponent++;
                        power *= i;
                        argument /= i;
                    } while (argument % i == 0);
                    value *= value(i, exponent, power);
                }
            }
            if (argument != 1) {
                value *= value(argument, 1, argument);
            }
            return value;
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputReader.SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public long readLong() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            long res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }

    static class IntegerUtils {
        public static long gcd(long a, long b) {
            a = Math.abs(a);
            b = Math.abs(b);
            while (b != 0) {
                long temp = a % b;
                a = b;
                b = temp;
            }
            return a;
        }

        public static long lcm(long a, long b) {
            return (a / gcd(a, b)) * b;
        }

    }
}

