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