def main():
    hours = int(input('enter hours worked this week '))
    while hours < 0 or hours > 40:
        print("Hours must be a number from 0 to 40")
        hours = int(input('enter hours worked this week '))        
    rate = float(input('enter hourly pay rate '))
    while rate <= 15.50 or rate > 100:
        # Print a different message, depending on what
        # is wrong
        if rate <= 15.50:
            print("the minimum rate is 15.50")
        elif rate > 100:
            print("the maximum rate is 100")
        rate = float(input('enter hourly pay rate '))
    grossPay = hours * rate
    print("Gross pay: $",format(grossPay,',.2f'),sep="")

main()