meal = raw_input("Cost of meal: ")
tax = raw_input("Tax: ")
tip = raw_input("Tip: ")

def convertInput(meal, tax, tip):
    retMeal = float(meal)
    retTax = float(tax)
    retTip = float(tip)
    return retMeal, retTax, retTip

def tipCalc(meal, tax, tip):

    retMeal, retTax, retTip = convertInput(meal, tax, tip)

    retTax = retTax / 100
    retTax = retTax * retMeal
    retMeal = retTax + retMeal
    retTip = retTip / 100
    retTip = retTip * retMeal
    total = retMeal + retTip
    print total

tipCalc(meal, tax, tip)