output_description: Print the number of sand in the upper bulb after t second.
  
  * * *
input_description: The input is given from Standard Input in the following format:
  
      
      
      X t
attempt: from collections import Counter
  
  # Nをセットする
  N = int(input())
  # aiをセットする
  a = list(map(int, input().split()))
  a_mai = []
  a_pura = []
  # ai +- 1したものを作る
  for i in range(len(a)):
      # +1したもの
      a_pura.append(a[i] + 1)
      # -1したもの
      a_mai.append(a[i] - 1)
  # aiそのままの重複の数
  count_a = Counter(a)
  # ai + 1重複の数
  count_a_pura = Counter(a_pura)
  # ai - 1の中腹の数
  counter_a_mai = Counter(a_mai)
  # 一番大きい要素を取得
  max_a = count_a.most_common()[0][1]
  max_a_pura = count_a_pura.most_common()[0][1]
  max_a_mai = counter_a_mai.most_common()[0][1]
  
  # 3つの最大値を求める
  max = max_a
  if max_a_pura >= max:
      max = max_a_pura
  if max_a_mai >= max:
      max = max_a_mai
  print(max)
  
problem_description: Statement
  
  We have a sandglass that runs for X seconds. The sand drops from the upper
  bulb at a rate of 1 gram per second. That is, the upper bulb initially
  contains X grams of sand.
  
  How many grams of sand will the upper bulb contains after t seconds?
samples: [{"input": "100 17", "output": "83\n    \n\n17 out of the initial 100 grams of sand will be consumed, resulting in 83\ngrams.\n\n* * *"}, {"input": "48 58", "output": "0\n    \n\nAll 48 grams of sand will be gone, resulting in 0 grams.\n\n* * *"}, {"input": "1000000000 1000000000", "output": "0"}]