output_description: Print the number of integers between A and B (inclusive) that can be evenly
  divided by neither C nor D.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      A B C D
attempt: def main2():
      a, b, c, d = list(map(int, input().split()))
  
      sss = b // c - (a - 1) // c
      ssss = b // d - (a - 1) // d
      di = 0
      for i in range(d, b, d):
          if i % c == 0:
              di = i
              break
      sssss = b // di - (a - 1) // di if di != 0 else 0
      print((b - a + 1) - (sss + ssss - sssss))
  
  
  if __name__ == "__main__":
      main2()
  
problem_description: Statement
  
  You are given four integers A, B, C, and D. Find the number of integers
  between A and B (inclusive) that can be evenly divided by neither C nor D.
samples: [{"input": "4 9 2 3", "output": "2\n    \n\n5 and 7 satisfy the condition.\n\n* * *"}, {"input": "10 40 6 8", "output": "23\n    \n\n* * *"}, {"input": "314159265358979323 846264338327950288 419716939 937510582", "output": "532105071133627368"}]