# Well done! Play with Sage and have fun with math.
if true:
    guess, value = var('guess, value')
    g = 42
    v = 43
    percentError(guess, value) = abs((guess - value)/value)*100
    print ("{:.3f}%".format(float(percentError(g, v))))
if true:
    factor(2016)

# In Pyhon, the language of SageMath, 1 = true, 0 = false
# Numers that are not zero are also interperted as true.
if 1:
    print ("Math = Phun")
if 0:   # See if you can change this line to make activate the indented code below.
    a, b = var('a, b')
    for p in range(4):
           ((a + b)^p).expand()