import java.util.Scanner;

public class HelloWorld {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        double salary = scan.nextDouble();
        int age = scan.nextInt();
        double buff = 0;
        if (salary <= 3000) {
            if (age <=55) System.out.println(salary*.2+salary*.17);
            else if (age<=60) System.out.println(salary*.13+salary*.13);
            else if (age<=65) System.out.println(salary*.075+salary*.09);
            else System.out.println(salary*.05+salary*.075);
        }
        else {
            System.out.println(3000*.2+3000*.2);

        }
    }
}