fruit = input()
day_of_the_week = input()
quantity = float(input())
price = 0
if day_of_the_week in ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']:
    if fruit == 'banana':
        price = quantity * 2.50
        print(f'{price:.2f}')
    elif fruit == 'apple':
        price = quantity * 1.20
        print(f'{price:.2f}')
    elif fruit == 'orange':
        price = quantity * 0.85
        print(f'{price:.2f}')
    elif fruit == 'grapefruit':
        price = quantity * 1.45
        print(f'{price:.2f}')
    elif fruit == 'kiwi':
        price = quantity * 2.70
        print(f'{price:.2f}')
    elif fruit == 'pineapple':
        price = quantity * 5.50
        print(f'{price:.2f}')
    elif fruit == 'grapes':
        price = quantity * 3.85
        print(f'{price:.2f}')
    else:
        print('error')
elif day_of_the_week in ['Saturday', 'Sunday']:
    if fruit == 'banana':
        price = quantity * 2.70
        print(f'{price:.2f}')
    elif fruit == 'apple':
        price = quantity * 1.25
        print(f'{price:.2f}')
    elif fruit == 'orange':
        price = quantity * 0.90
        print(f'{price:.2f}')
    elif fruit == 'grapefruit':
        price = quantity * 1.60
        print(f'{price:.2f}')
    elif fruit == 'kiwi':
        price = quantity * 3.00
        print(f'{price:.2f}')
    elif fruit == 'pineapple':
        price = quantity * 5.60
        print(f'{price:.2f}')
    elif fruit == 'grapes':
        price = quantity * 4.20
        print(f'{price:.2f}')
else:
    print('error')