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