output_description: Print the circumference of the circle. Your output is considered correct if
  and only if its absolute or relative error from our answer is at most 10^{-2}.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      R
attempt: N, K = map(int, input().split())
  
  if K == N + 1:
      print(1)
  elif K == N:
      print(N + 2)
  else:
  
      zentori = []
      for i in range(1, 2 ** (N + 1)):
          baai = []
          for j in range(N + 1):
              if (i >> j) & 1:
                  baai.append(j)
          if len(baai) >= K:
              zentori.append((sum(baai), len(baai)))
  
      setzentori = set(zentori)
      print(int(len(setzentori) % (10**9 + 7)))
  
problem_description: Statement
  
  Print the circumference of a circle of radius R.
samples: [{"input": "1", "output": "6.28318530717958623200\n    \n\nSince we accept an absolute or relative error of at most 10^{-2}, 6.28 is also\nan acceptable output, but 6 is not.\n\n* * *"}, {"input": "73", "output": "458.67252742410977361942"}]