import java.util.Scanner;
public class Main
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int Q1 = x / 500;
        x = x % 500;
        int Q2 = x / 5;
        int result = (Q1 * 1000) + Q2 * 5;
        System.out.println(result);
    }
} import java.util.Scanner; Scanner java.util public class Main
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int Q1 = x / 500;
        x = x % 500;
        int Q2 = x / 5;
        int result = (Q1 * 1000) + Q2 * 5;
        System.out.println(result);
    }
} Main public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int Q1 = x / 500;
        x = x % 500;
        int Q2 = x / 5;
        int result = (Q1 * 1000) + Q2 * 5;
        System.out.println(result);
    } main {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int Q1 = x / 500;
        x = x % 500;
        int Q2 = x / 5;
        int result = (Q1 * 1000) + Q2 * 5;
        System.out.println(result);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int x = sc.nextInt(); x sc.nextInt() sc.nextInt sc int Q1 = x / 500; Q1 x / 500 x 500 x = x % 500 x x % 500 x 500 int Q2 = x / 5; Q2 x / 5 x 5 int result = (Q1 * 1000) + Q2 * 5; result (Q1 * 1000) + Q2 * 5 (Q1 * 1000) Q1 1000 Q2 * 5 Q2 5 System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int Q1 = x / 500;
        x = x % 500;
        int Q2 = x / 5;
        int result = (Q1 * 1000) + Q2 * 5;
        System.out.println(result);
    }
} public class Main
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int Q1 = x / 500;
        x = x % 500;
        int Q2 = x / 5;
        int result = (Q1 * 1000) + Q2 * 5;
        System.out.println(result);
    }
} Main
import java.util.Scanner;
public class Main
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int Q1 = x / 500;
        x = x % 500;
        int Q2 = x / 5;
        int result = (Q1 * 1000) + Q2 * 5;
        System.out.println(result);
    }
}
