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){//满5000全额打6折
cost += ((price)*0.6);
}else if(price >= 2000){//满2000全额打7折
cost += ((price)*0.7);
}else if(price >= 500){//满500全额打8折
cost += ((price)*0.8);
}else if(price >= 100){//满100全额打9折
cost += ((price)*0.9);
}else{
cost += price;
}
System.out.println(cost);
}
}