fruit = input()
day = input()
quantity = float(input())

price = 0

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