# Author:  James Tam
# Version: 2014

MIN_INCOME = 0
runAgain = "yes"
while (runAgain == "yes"): #Outer loop
    print("CALCULATING A TAX RETURN")
    income = -1
    while (income < MIN_INCOME): #Inner loop
        income = int(input("Income $"))
    runAgain = input("To calculate another" + \
      " return enter 'yes': ")