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 / 2 + 1);
    }
  }
}