package algo;

import java.util.Scanner;

public class sample7 {

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