output_description: Print the answer.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N K
attempt: n, k = map(int, input().split())
  n1 = 1
  while n > 0:
      n1 *= n
      n -= 1
  r = n - k
  r1 = 1
  while r > 0:
      r1 *= r
      r -= 1
  k1 = 1
  while k > 0:
      k1 *= k
      k -= 1
  a = r1 * k1
  print(n1 // a)
  
problem_description: Statement
  
  Snuke has N integers: 1,2,\ldots,N. He will choose K of them and give those to
  Takahashi.
  
  How many ways are there to choose K consecutive integers?
samples: [{"input": "3 2", "output": "2\n    \n\nThere are two ways to choose two consecutive integers: (1,2) and (2,3).\n\n* * *"}, {"input": "13 3", "output": "11"}]