TASK_05

def calculate_tax(age, salary, job):
    age = int(age)
    salary = int(salary)
    if age<18:
        return 0
    elif job == "PRESIDENT":
        return 0
    elif salary<10000:
        return 0
    elif salary>=10000 and salary<=20000:
        return salary*0.05
    elif salary>20000:
        return salary*0.1

age = input()
sal = input()
job = input()
print(calculate_tax(age,sal,job))