import java.util.*;

public class Main {

    public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();

        if(a%2 == 0) {
            System.out.println(a/2);
        }else {
            System.out.println(a/2 + a%2);
        }

    }
} import java.util.*; util.* java public class Main {

    public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();

        if(a%2 == 0) {
            System.out.println(a/2);
        }else {
            System.out.println(a/2 + a%2);
        }

    }
} Main public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();

        if(a%2 == 0) {
            System.out.println(a/2);
        }else {
            System.out.println(a/2 + a%2);
        }

    } main {
        final Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();

        if(a%2 == 0) {
            System.out.println(a/2);
        }else {
            System.out.println(a/2 + a%2);
        }

    } final Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc if(a%2 == 0) {
            System.out.println(a/2);
        }else {
            System.out.println(a/2 + a%2);
        } a%2 == 0 a%2 a 2 0 {
            System.out.println(a/2);
        } System.out.println(a/2) System.out.println System.out System System.out a/2 a 2 {
            System.out.println(a/2 + a%2);
        } System.out.println(a/2 + a%2) System.out.println System.out System System.out a/2 + a%2 a/2 a 2 a%2 a 2 final String[] args args public class Main {

    public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();

        if(a%2 == 0) {
            System.out.println(a/2);
        }else {
            System.out.println(a/2 + a%2);
        }

    }
} public class Main {

    public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();

        if(a%2 == 0) {
            System.out.println(a/2);
        }else {
            System.out.println(a/2 + a%2);
        }

    }
} Main
import java.util.*;

public class Main {

    public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();

        if(a%2 == 0) {
            System.out.println(a/2);
        }else {
            System.out.println(a/2 + a%2);
        }

    }
}