import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		if(a % 2 == 0) {
			System.out.println(a / 2);
		} else {
			System.out.println(a / 2 + 1);
		}
	}
}
