import java.util.Scanner;
public class Traveller{
	public static void main(String[] args){
		Scanner sc1 = new Scanner(System.in);
		int n = sc1.nextInt();
		if(n % 2 == 0){
			n = n/2;
		}else{
			n = n/2 + 1;
		}
		System.out.println(n);
	}
}