# Name: Sihan Zheng
# Data: October 12
# Class: ICS201-01
# Description: Calculate the amount on income tax someone needs to pay

#set the different tax rates and brackets
bracket1 = 40970.00
bracket1rate = 0.15
bracket2 = 40971.00
bracket2rate = 0.22
bracket3 = 45080.00
bracket3rate = 0.26
bracket4 = bracket1+bracket2+bracket3
bracket4rate = 0.29
#get the user's income
while True:
    try:
        income = input('please enter your income: ')
        break
    except:
        print 'Please enter a number.'

#calculate the tax needed
if income <= bracket1:
    tax = income * bracket1rate
elif income > bracket1 and income <= bracket1+bracket2:
    tax = bracket1 * bracket1rate + (income - bracket1) * bracket2rate
elif income > bracket1+bracket2 and income <= bracket1+bracket2+bracket3:
    tax = bracket1 * bracket1rate + bracket2 * bracket2rate + (income - bracket2) * bracket3rate
elif income > bracket4:
    tax = bracket1 * bracket1rate + bracket2 * bracket2rate + bracket3* bracket3rate + (income - bracket4)* bracket4rate

#outputs the tax needed
print 'You have to pay $%.2f in taxes' %tax