text: import os
  import sys
  sys.path.append(os.path.join(os.path.dirname(__file__), '../tools'))
  
  import files
  
  
  def main(argv):
      a, b = files.read_line_of_ints(argv[0])
  
      print sum(i for i in xrange(a, b + 1) if i % 2 == 1)
  
  
  if __name__ == "__main__":
      main(sys.argv[1:])
  