import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		Scanner scan =new Scanner(System.in);
		double n = scan.nextDouble();
		scan.close();
		double d = n / 2;
		int i = (int)Math.ceil(d);
		System.out.println(i);
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz