import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        System.out.println(1000*(X/500)+((X%500)/5)*5);
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        System.out.println(1000*(X/500)+((X%500)/5)*5);
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        System.out.println(1000*(X/500)+((X%500)/5)*5);
    } main {
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        System.out.println(1000*(X/500)+((X%500)/5)*5);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int X = Integer.parseInt(sc.next()); X Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc System.out.println(1000*(X/500)+((X%500)/5)*5) System.out.println System.out System System.out 1000*(X/500)+((X%500)/5)*5 1000*(X/500) 1000 (X/500) X 500 ((X%500)/5)*5 ((X%500)/5) (X%500) X 500 5 5 String[] args args public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        System.out.println(1000*(X/500)+((X%500)/5)*5);
    }
} public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        System.out.println(1000*(X/500)+((X%500)/5)*5);
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        System.out.println(1000*(X/500)+((X%500)/5)*5);
    }
}