import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        // ##### 初期読み込み #######################################################################

        // 1行 数字 1文字 ---------------------------------------------------------------------------
        long a = Long.parseLong(scanner.nextLine());



        // ##### メイン処理 #######################################################################
        if (a % 2 == 0) {
            System.out.println(a /2);
        } else {
            System.out.println((a + 1) / 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