import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        int pageNum = 0;

        Scanner scanner = new Scanner(System.in);
        String inputPageNum = scanner.nextLine();
        scanner.close();
        pageNum = Integer.parseInt(inputPageNum);

        int printOutPage = 0;
        if (pageNum % 2 == 0) {
            printOutPage = pageNum / 2;
        } else {
            printOutPage = pageNum / 2 + 1;
        }
        System.out.println(printOutPage);

    }
}
/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