import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        //int b = sc.nextInt();
        if (a == 0)
            System.out.println(0);
        else if (a % 2 == 0)
            System.out.println(a / 2);
        else
            System.out.println((a / 2) + 1);
    }
} import java.util.*; util.* java class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        //int b = sc.nextInt();
        if (a == 0)
            System.out.println(0);
        else if (a % 2 == 0)
            System.out.println(a / 2);
        else
            System.out.println((a / 2) + 1);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        //int b = sc.nextInt();
        if (a == 0)
            System.out.println(0);
        else if (a % 2 == 0)
            System.out.println(a / 2);
        else
            System.out.println((a / 2) + 1);
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        //int b = sc.nextInt();
        if (a == 0)
            System.out.println(0);
        else if (a % 2 == 0)
            System.out.println(a / 2);
        else
            System.out.println((a / 2) + 1);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc if (a == 0)
            System.out.println(0);
        else if (a % 2 == 0)
            System.out.println(a / 2);
        else
            System.out.println((a / 2) + 1); a == 0 a 0 System.out.println(0) System.out.println System.out System System.out 0 if (a % 2 == 0)
            System.out.println(a / 2);
        else
            System.out.println((a / 2) + 1); a % 2 == 0 a % 2 a 2 0 System.out.println(a / 2) System.out.println System.out System System.out a / 2 a 2 System.out.println((a / 2) + 1) System.out.println System.out System System.out (a / 2) + 1 (a / 2) a 2 1 String[] args args
import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        //int b = sc.nextInt();
        if (a == 0)
            System.out.println(0);
        else if (a % 2 == 0)
            System.out.println(a / 2);
        else
            System.out.println((a / 2) + 1);
    }
}