import java.util.*;

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



