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);
}
}