import java.util.*;

class Main{

    Main(){
        Scanner SC = new Scanner(System.in);
        int N = Integer.parseInt(SC.next());

        if((N & 1) == 1)
        N += 1;
        System.out.println(N/2);
    }

    public static void main(String[] args){
        Main main = new Main();
    }
}

/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