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);
        }
        
        sc.close();
    }
}