import java.util.*;

public class Main {

    public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();

        if(a%2 == 0) {
            System.out.println(a/2);
        }else {
            System.out.println(a/2 + a%2);
        }

    }
}
/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