new_contents: # # -*- coding: utf-8 -*-
  # print(45678 + 0x12fd2);
  # print('Learn Python in imooc');
  # print(100 < 99);
  # print(0xff == 255);
  # print (u'''静夜思
  # 床前明月光，
  # 疑是地上霜，
  # 举头望明月，
  # 低头思故乡.''');
  sum = 0;
  x = 1;
  n = 1;
  while True:
      sum += x;
      n += 1;
      x = 2**n;
      if n > 19:
          break
  print(sum);
  
subject: add 1st py file