#EXERCISE 2.1

print("EXERCISE 2.1")

print(01)

print(010)

print(0100)

print(01000)

#EXERCISE 2.2

print("EXERCISE 2.2")

5

x = 5

x + 1

print(5)

print("x=5")

print(x+1)

#EXERCISE 2.3

print("EXERCISE 2.3")

width = 17

height = 12.0

delimiter = '.'

print (width / 2)

print (width / 2.0)

print (height / 3)

print (1 + 2 * 5)

print (delimiter * 5)

#EXERCISE 2.4

print("EXERCISE 2.4")

print("PART 1")

pi = 3.141592653589732

r = 5

volume = 4/3.0*pi*r*r*r

print(volume)

print("PART 2")

cover_price = 24.95

discount_price = .4*cover_price

first_copy_shipping = 3

additional_shipping = .75

cost_60_books = discount_price*60+first_copy_shipping+additional_shipping*59

print(cost_60_books)

print("PART 3")

print(8.25*1 + 7.2*3)

print(.85*60)

print("I RETURN AT AROUND")

print("7:22")