import java.util.Scanner;
public class HelloWorld {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double salary = scanner.nextDouble();
        double[] schijven;
        schijven = new double[5];

        schijven[1] = (19982);
        schijven[2] = (33791);
        schijven[3] = (67072);
        schijven[4] = (67072);

        double[] belasting;
        belasting = new double[5];

        if (schijven[1] > salary) {
            belasting[1] = ((schijven[1] - salary) * 0.3655);
        } else {
            belasting[1] = schijven[1] * 0.3655;
            salary = salary - schijven[1];

            if (schijven[2] > salary) {
                belasting[2] = (salary * 0.408);
            } else {
                belasting[2] = schijven[2] * 0.408;
                salary = salary - schijven[2];

                if (belasting[3] > salary) {
                    belasting[3] = (salary * 0.408);
                } else {
                    belasting[3] = schijven[3] * 0.408;
                    salary = salary - schijven[3];

                    belasting[4] = (salary * 0.52);
                }
            }
        }
        System.out.println(belasting[1]+belasting[2]+belasting[3]+belasting[4]);}
}