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