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());
        sc.close();

        //硬貨の枚数
        int count500 = 0;
        int count5 = 0;
        //残高
        int remain = 0;
        //嬉しさ合計
        int happy500 = 0;
        int happy5 = 0;

        count500 = X / 500;
        happy500 = 1000 * count500;
        remain = X - (500 * count500);

        count5 = remain / 5;
        happy5 = 5 * count5;

        System.out.println(happy500 + happy5);

    }

} 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());
        sc.close();

        //硬貨の枚数
        int count500 = 0;
        int count5 = 0;
        //残高
        int remain = 0;
        //嬉しさ合計
        int happy500 = 0;
        int happy5 = 0;

        count500 = X / 500;
        happy500 = 1000 * count500;
        remain = X - (500 * count500);

        count5 = remain / 5;
        happy5 = 5 * count5;

        System.out.println(happy500 + happy5);

    }

} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        sc.close();

        //硬貨の枚数
        int count500 = 0;
        int count5 = 0;
        //残高
        int remain = 0;
        //嬉しさ合計
        int happy500 = 0;
        int happy5 = 0;

        count500 = X / 500;
        happy500 = 1000 * count500;
        remain = X - (500 * count500);

        count5 = remain / 5;
        happy5 = 5 * count5;

        System.out.println(happy500 + happy5);

    } main {
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        sc.close();

        //硬貨の枚数
        int count500 = 0;
        int count5 = 0;
        //残高
        int remain = 0;
        //嬉しさ合計
        int happy500 = 0;
        int happy5 = 0;

        count500 = X / 500;
        happy500 = 1000 * count500;
        remain = X - (500 * count500);

        count5 = remain / 5;
        happy5 = 5 * count5;

        System.out.println(happy500 + happy5);

    } 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 sc.close() sc.close sc int count500 = 0; count500 0 int count5 = 0; count5 0 int remain = 0; remain 0 int happy500 = 0; happy500 0 int happy5 = 0; happy5 0 count500 = X / 500 count500 X / 500 X 500 happy500 = 1000 * count500 happy500 1000 * count500 1000 count500 remain = X - (500 * count500) remain X - (500 * count500) X (500 * count500) 500 count500 count5 = remain / 5 count5 remain / 5 remain 5 happy5 = 5 * count5 happy5 5 * count5 5 count5 System.out.println(happy500 + happy5) System.out.println System.out System System.out happy500 + happy5 happy500 happy5 String[] args args public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        sc.close();

        //硬貨の枚数
        int count500 = 0;
        int count5 = 0;
        //残高
        int remain = 0;
        //嬉しさ合計
        int happy500 = 0;
        int happy5 = 0;

        count500 = X / 500;
        happy500 = 1000 * count500;
        remain = X - (500 * count500);

        count5 = remain / 5;
        happy5 = 5 * count5;

        System.out.println(happy500 + happy5);

    }

} public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int X = Integer.parseInt(sc.next());
        sc.close();

        //硬貨の枚数
        int count500 = 0;
        int count5 = 0;
        //残高
        int remain = 0;
        //嬉しさ合計
        int happy500 = 0;
        int happy5 = 0;

        count500 = X / 500;
        happy500 = 1000 * count500;
        remain = X - (500 * count500);

        count5 = remain / 5;
        happy5 = 5 * count5;

        System.out.println(happy500 + happy5);

    }

} 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());
        sc.close();

        //硬貨の枚数
        int count500 = 0;
        int count5 = 0;
        //残高
        int remain = 0;
        //嬉しさ合計
        int happy500 = 0;
        int happy5 = 0;

        count500 = X / 500;
        happy500 = 1000 * count500;
        remain = X - (500 * count500);

        count5 = remain / 5;
        happy5 = 5 * count5;

        System.out.println(happy500 + happy5);

    }

}
