import java.util.*;

public class Main{
	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);
		}

		sc.close();
	}



}