import java.util.Scanner;
public class Main {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
double m=input.nextDouble();
double p =0;
if(m<=100000)
p=m*0.1;
else if(m<=200000)
p=100000*0.1+(m-100000)*0.075;
else if(m<=400000)
p=100000*0.1+100000*0.075+(m-200000)*0.05;
else if(m<=600000)
p=100000*0.1+100000*0.075+200000*0.05+(m-400000)*0.03;
else if(m<=1000000)
p=100000*0.1+100000*0.075+200000*0.05+200000*0.03+(m-600000)*0.015;
else
p=100000*0.1+100000*0.075+200000*0.05+200000*0.03+400000*0.015+(m-1000000)*0.01;
System.out.printf("%.2f",p);
}
}
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