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);
    }else{
      System.out.println(N / 2 + 1);
    }
  }
}
