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);
		}
	}

}