text: 
  s = 0
  for num in range(100):
      if num % 2 == 1:
          s = s + num
  
  print(num, s)
  
  s = 0
  
  for num in range(50):
      s = s + (2 * num + 1)
      print('2*num+1 =', 2 * num + 1)
  
  print('final sum =', s)
  
  
  for idx in range(20):
      print('*' * (idx+1))
  