import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		int N=scan.nextInt();
		if(N%2==0)
		{
		System.out.println(N/2);
		}
		else
		{
			System.out.println((N/2)+1);
		}

	}

}