import java.util.*;
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);
    }else{
      System.out.println((n+1)/2);
    }
  }
}