import java.util.Scanner;
class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int kotae=0;int Ancer=0;
        int num = scan.nextInt();
        kotae=num/2;
        if(num%2==0){
            Ancer=kotae;
        }
        if(num%2==1){
            Ancer=kotae+1;
        }
    System.out.println(Ancer);
    }

}

/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