output_description: Print x rounded up to the nearest integer.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      a b
attempt: N = int(input().rstrip())
  numbers = [int(i) for i in input().rstrip().split()]
  
  
  n_dic = {str(i): 0 for i in set(numbers)}
  
  
  for i in numbers:
      n_dic[str(i)] += 1
  
  count = 0
  
  for i, j in n_dic.items():
      if int(i) < j:
          count += j - int(i)
  
      elif int(i) > j:
          count += j
  
  print(count)
  
problem_description: Statement
  
  You are given two positive integers a and b. Let x be the average of a and b.
  Print x rounded up to the nearest integer.
samples: [{"input": "1 3", "output": "2\n    \n\nThe average of 1 and 3 is 2.0, and it will be rounded up to the nearest\ninteger, 2.\n\n* * *"}, {"input": "7 4", "output": "6\n    \n\nThe average of 7 and 4 is 5.5, and it will be rounded up to the nearest\ninteger, 6.\n\n* * *"}, {"input": "5 5", "output": "5"}]