import java.io.*;
import java.util.*;

public class Main {
	public static void main (String[] args) {
	Scanner s=new Scanner(System.in);	
	long n=s.nextLong();
	long k=n/2;
	if(n%2==0)
	{}
	else
	k++;
	System.out.println(k);
	}
}
/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