output_description: Print 1 if x is equal to 0, or 0 if x is equal to 1.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      x
attempt: a, b, c, d = map(int, input().split())
  
  if a >= 0 and b >= 0 and c >= 0 and d >= 0:
      print(b * d)
  elif a >= 0 and b >= 0 and c <= 0 and d <= 0:
      print(a * d)
  elif a >= 0 and b >= 0 and c <= 0 and d >= 0:
      print(b * d)
  elif a <= 0 and b >= 0 and c >= 0 and d >= 0:
      print(b * d)
  elif a <= 0 and b <= 0 and c <= 0 and d >= 0:
      print(a * c)
  elif a <= 0 and b <= 0 and c >= 0 and d >= 0:
      print(a * c)
  elif a <= 0 and b <= 0 and c <= 0 and d <= 0:
      print(a * d)
  elif a <= 0 and b <= 0 and c <= 0 and d >= 0:
      print(a * c)
  elif a <= 0 and b >= 0 and c <= 0 and d >= 0:
      x = a * c
      y = b * d
      # print(x,y)
      if x >= y:
          print(x)
      else:
          print(y)
  
problem_description: Statement
  
  Given is an integer x that is greater than or equal to 0, and less than or
  equal to 1. Output 1 if x is equal to 0, or 0 if x is equal to 1.
samples: [{"input": "1", "output": "0\n    \n\n* * *"}, {"input": "0", "output": "1"}]