public class Main {

    public static void main(String[] args) {
        int page = new Integer(getLine()[0]);
        int ans = page/2;
        if(page % 2 == 1){
            ans += 1;
        }
        System.out.println(ans);
    }

    public static String[] getLine(){
        java.util.Scanner scan = new java.util.Scanner(System.in);
        return scan.nextLine().split(" ");
    }
}

/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