import java.util.*;
public class Main
{
public static void main(String[] args) {
Scanner sc  = new Scanner(System.in);
int x = sc.nextInt();
int result =0;
int div=0;
if(x>=500){
   div = x/500;
    result = div*2*500;

}

x = x-(div*500);


result+= x;

if(x%5!=0){
result=result- (x%5);


}
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