import java.util.Scanner;

public class Main {

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

	}

}