

import java.util.Scanner;


public class Main {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        int a = input.nextInt();


   int c = a/500;
   int b = a%500;
   int remainder = b%5;


       System.out.println(1000*c+(b-remainder));

    }



}
/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