# Exercise 3.1 / 3.2
# Asking for input to calculate weekly pay and to calculate overtime when
# working more than 40 hours.

try:
    hrs = float(raw_input('How many hours did you work this week? \n'))
    rate = float(raw_input('What is your rate? \n'))
    otrate = 1.5
    othrs = hrs - 40
    ot = float(rate * 40 + rate * otrate * (othrs))

except:
    print 'Please enter a number.'
    quit()

if hrs <= 40 :
    wpay = float(hrs*rate)
    print 'Pay: ', wpay

else:
    otpay = float(rate * otrate * othrs)
    print 'Pay: ', ot
    print 'Included overtime pay: ', otpay , '\n'

# Exercise 3.3
# Grade scores based on input. Write errors of input if out of range.

try:
    scr = float(raw_input('Please enter a number between 0.0 and 1.0. \n'))
    if (scr > 1.0 or scr < 0.0):
        print 'Please enter a valid number'
        quit()
except:
    print 'Please enter a number.'
    quit()

if scr >= 0.9 :
    print 'Grade: A'
elif scr >= 0.8 :
    print 'Grade: B'
elif scr >= 0.7 :
    print 'Grade: C'
elif scr >= 0.6 :
    print 'Grade: D'
else:
    print 'Grade: F'