import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {

    public static void main(String[] args) throws Exception {

        try {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            int result = (int) Math.round((Double.parseDouble(br.readLine()) / 2));
            
            System.out.println(result);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io class Main {

    public static void main(String[] args) throws Exception {

        try {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            int result = (int) Math.round((Double.parseDouble(br.readLine()) / 2));
            
            System.out.println(result);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    }
} Main public static void main(String[] args) throws Exception {

        try {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            int result = (int) Math.round((Double.parseDouble(br.readLine()) / 2));
            
            System.out.println(result);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    } main {

        try {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            int result = (int) Math.round((Double.parseDouble(br.readLine()) / 2));
            
            System.out.println(result);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    } try {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            int result = (int) Math.round((Double.parseDouble(br.readLine()) / 2));
            
            System.out.println(result);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } IOException | NumberFormatException e {
            e.printStackTrace();
            System.exit(0);
        } e.printStackTrace() e.printStackTrace e System.exit(0) System.exit System 0 catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        } final Exception e {
            e.printStackTrace();
            System.exit(0);
        } e.printStackTrace() e.printStackTrace e System.exit(0) System.exit System 0 {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            int result = (int) Math.round((Double.parseDouble(br.readLine()) / 2));
            
            System.out.println(result);
        } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) int result = (int) Math.round((Double.parseDouble(br.readLine()) / 2)); result (int) Math.round((Double.parseDouble(br.readLine()) / 2)) Math.round Math (Double.parseDouble(br.readLine()) / 2) Double.parseDouble(br.readLine()) Double.parseDouble Double br.readLine() br.readLine br 2 System.out.println(result) System.out.println System.out System System.out result String[] args args
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {

    public static void main(String[] args) throws Exception {

        try {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            int result = (int) Math.round((Double.parseDouble(br.readLine()) / 2));
            
            System.out.println(result);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    }
}