import java.util.*;

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