output_description: If N=1, print `Hello World`; if N=2, print A+B.
  
  * * *
input_description: Input is given from Standard Input in one of the following formats:
  
      
      
      1
      
      
      
      2
      A
      B
attempt: n = int(input)
  
  print('Hello World' if n == 1)
  
  if n == 2:
      for _ in range(2):
          a = [int(input())]
  
      print(a[0]+a[1])
problem_description: Statement
  
  In 2020, AtCoder Inc. with an annual sales of more than one billion yen (the
  currency of Japan) has started a business in programming education.  
  One day, there was an exam where a one-year-old child must write a program
  that prints `Hello World`, and a two-year-old child must write a program that
  receives integers A, B and prints A+B.  
  Takahashi, who is taking this exam, suddenly forgets his age.  
  He decides to write a program that first receives his age N (1 or 2) as input,
  then prints `Hello World` if N=1, and additionally receives integers A, B and
  prints A+B if N=2.  
  Write this program for him.
samples: [{"input": "1", "output": "Hello World\n    \n\nAs N=1, Takahashi is one year old. Thus, we should print `Hello World`.\n\n* * *"}, {"input": "2\n    3\n    5", "output": "8\n    \n\nAs N=2, Takahashi is two years old. Thus, we should print A+B, which is 8\nsince A=3 and B=5."}]