import java.util.*;
import java.util.Scanner;
class Main{
    public static void main(String[] args)
    {
        int n;
        int result;
        int cal1;
        Scanner scanner = new Scanner(System.in);
        n = scanner.nextInt();

        if(n % 2 == 0){
            result = n / 2;
        }else{
            cal1 = n % 2;
            result = n / 2 + cal1;
        }
        
        System.out.println(result);
    }
}
/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