#!/usr/bin/python

# P2PU - Python Programming 101 - Chapter 8 - Functions
# Python for Informatics - Chapter 4 - Functions
# Exercise 4.6

def computepay(hours, rate):
   pay   = hours * rate
   if hours > 40 : pay = pay + (hours - 40) * rate * 0.5
   return round(pay,2)

try:
   h = float(raw_input('Enter Hours: '))
   r  = float(raw_input('Enter Rate : '))
except:
   print 'Error, please enter numeric input!'
   exit()

print 'Pay:', computepay(h,r)