import java.util.Scanner;

public class P03_MobileOperator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String contractValue = scanner.nextLine().toLowerCase();
        String contractType = scanner.nextLine().toLowerCase();
        String internet = scanner.nextLine().toLowerCase();
        int contractMounts = Integer.parseInt(scanner.nextLine());

        double contactSum = 0;

        if (contractValue.equals("one")){
            if (contractType.equals("small")){
                contactSum += 9.98;
                if (internet.equals("yes")){
                    contactSum += 5.50;
                }

            }if (contractType.equals("middle")){
                contactSum+=18.99;
                if (internet.equals("yes")){
                    contactSum+= 4.35;
                }
            }if (contractType.equals("large")){
                contactSum+=25.98;
                if (internet.equals("yes")){
                    contactSum+= 4.35;
                }
            }if (contractType.equals("extralarge")){
                contactSum+=18.99;
                if (internet.equals("yes")){
                    contactSum+= 3.85;
                }
            }
        }else if (contractValue.equals("two")){
            if (contractType.equals("small")){
                contactSum += 8.58;
                if (internet.equals("yes")){
                    contactSum += 5.50;
                }

            }if (contractType.equals("middle")){
                contactSum+=17.09;
                if (internet.equals("yes")){
                    contactSum+= 4.35;
                }
            }if (contractType.equals("large")){
                contactSum+=23.59;
                if (internet.equals("yes")){
                    contactSum+= 4.35;
                }
            }if (contractType.equals("extralarge")){
                contactSum+=31.79;
                if (internet.equals("yes")){
                    contactSum+= 3.85;
                }
            }
            contactSum = contactSum - (contactSum*0.0375);
        }
        contactSum*= contractMounts;
        System.out.printf("%.02f lv.", contactSum);
    }
}