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);
}
}

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