import java.util.Scanner;

public class KalkulatorDanatsi
{
  public static void main(String[] args)
  {
    Scanner in = new Scanner(System.in);
    System.out.println("Въведи годишна заплата");
    final double taxSecondTwenty = 0.10;
    final double taxThirdTwenty = 0.20;
    final double taxAboveThirdTwenty = 0.30;

    double tax = 0;
    int salaryTaxBase = 20000;
    double salary = in.nextDouble();
    if (salary <= 20000){
      System.out.println("Данък: 0");
    } else if (salary > 20000 && salary <= 40000){
      tax = (salary - salaryTaxBase)*taxSecondTwenty;
      System.out.println(tax);
    } else if (salary > 40000 && salary <= 60000){
      tax = ((salary - (2 * salaryTaxBase)) * taxThirdTwenty) + (salaryTaxBase * taxSecondTwenty);
      System.out.println(tax);
    } else {
      tax = ((salary - (3 * salaryTaxBase)) * taxAboveThirdTwenty) + (salaryTaxBase * taxSecondTwenty) + (salaryTaxBase * taxThirdTwenty);
      System.out.println(tax);
    }

  }

}