import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int number500 = 0;
        int number5 = 0;
        while (x >= 500) {
            number500++;
            x -= 500;
        }
        while (x >= 5) {
            number5++;
            x -= 5;
        }
        int happy = 1000 * number500 + 5 * number5;
        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