output_description: Print the number of the Shichi-Go-San numbers between 1 and N (inclusive).
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N
attempt: n = int(input())
  x = [0, 3, 5, 7]
  p = []
  flag = True
  flag2 = True
  for c1 in x:
      for c2 in x:
          for c3 in x:
              for c4 in x:
                  for c5 in x:
                      for c6 in x:
                          for c7 in x:
                              for c8 in x:
                                  for c9 in x:
                                      line = [c1, c2, c3, c4, c5, c6, c7, c8, c9]
                                      sum_ = 0
                                      if (
                                          line.count(7) > 0
                                          and line.count(3) > 0
                                          and line.count(5) > 0
                                      ):
                                          for i in range(9):
                                              if flag == False and line[i] in [3, 5, 7]:
                                                  flag2 = False
                                                  break
                                              if line[i] == 0:
                                                  flag = False
                                              sum_ += line[i] * 10**i
                                          if flag2 == False:
                                              flag = True
                                              flag2 = True
                                              continue
                                          p.append(sum_)
                                          flag = True
  p.sort()
  for i in range(len(p)):
      if p[i] > n:
          print(i)
          exit()
  
problem_description: Statement
  
  You are given an integer N. Among the integers between 1 and N (inclusive),
  how many _Shichi-Go-San numbers_ (literally "Seven-Five-Three numbers") are
  there?
  
  Here, a Shichi-Go-San number is a positive integer that satisfies the
  following condition:
  
    * When the number is written in base ten, each of the digits `7`, `5` and `3` appears at least once, and the other digits never appear.
samples: [{"input": "575", "output": "4\n    \n\nThere are four Shichi-Go-San numbers not greater than 575: 357, 375, 537 and\n573.\n\n* * *"}, {"input": "3600", "output": "13\n    \n\nThere are 13 Shichi-Go-San numbers not greater than 3600: the above four\nnumbers, 735, 753, 3357, 3375, 3537, 3557, 3573, 3575 and 3577.\n\n* * *"}, {"input": "999999999", "output": "26484"}]