#Even numbers to 20
for x in range(21):
    if x % 2 == 0:
        print(x)

#100 squares
x = 1
while x < 101:
    print("The square of " + str(x) + " is " + str(x ** 2))
    x = x + 1

#Counting down from 100
for x in range(100):
    print(100 - x)