import java.util.*;

public class Main {

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

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

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

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

public class Main {

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