import java.util.*;


class Main{
public static void main(String[] args) {
  Scanner reader=new Scanner(System.in);
  int x=reader.nextInt();
  int sum=x;
  int happy=0;
  happy=sum/500*1000;
    sum=sum-sum/500*500;
    happy+=sum/5*5;
    System.out.println(happy);


}
}
/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