# Python3

def pickingNumbers(a):
    maxL = 0
    for e,i in enumerate(a):
      x = []
      x.append(i)
      A = a.copy()
      A.pop(e)
      for j in A:
        if j == x[0] or abs(j - x[0] == 1):
          x.append(j)
      if len(x) > maxL:
        maxL = len(x)
        
    
    return maxL