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;
if(price >= 100){
cost =(int)(price * 0.9);
}
if(price >= 500){
cost =(int)(price * 0.8);
}
if(price >= 2000){
cost =(int)(price * 0.7);
}
if(price >= 5000){
cost =(int)(price * 0.6);
}
if(price < 1){
cost = 0;
}
System.out.println(cost);
}