import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int price = console.nextInt();
        int cost = 0;

        //write your code here......
        if (price >= 5000) {
            cost = (int)(price * 0.6);
        } else if (price >= 2000) {
            cost = (int)(price * 0.7);
        } else if (price >= 500) {
            cost = (int)(price * 0.8);
        } else if (price >= 100) {
            cost = (int)(price * 0.9);
        } else {
            cost = price;
        }

        System.out.println(cost);
    }
}