output_description: If we can choose K integers as above, print `YES`; otherwise, print `NO`.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N K
attempt: i = list(map(int, input().split()))
  n = i[0]
  k = i[1]
  
  if n >= 1 and n <= 100 and k >= 1 and k <= 100:
    if n > 2:
      if n > k - 2:
        if n % 2 == 1:
          if n / k >= 1:
            print("YES")
          elif n % k == 1:
            print("YES")
          else:
            print("NO")
        elif:
          if n / k >= 2:
            print("YES")
          elif n % k == 0:
            print("YES")
          else:
            print("NO")
        else:
          print("NO")
      else:
        print("NO")
    else:
      print("NO")
  else:
    print("NO")
  
problem_description: Statement
  
  Determine if we can choose K different integers between 1 and N (inclusive) so
  that no two of them differ by 1.
samples: [{"input": "3 2", "output": "YES\n    \n\nWe can choose 1 and 3.\n\n* * *"}, {"input": "5 5", "output": "NO\n    \n\n* * *"}, {"input": "31 10", "output": "YES\n    \n\n* * *"}, {"input": "10 90", "output": "NO"}]