import java.util.Scanner;

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 + 1) / 2);
		}
	}
}
