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 < 1){
        cost = (int)price;
    }else 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);
}

}