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