output_description: Print the minimum possible value of S_{max} - S_{min}.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      H W
attempt: h, w = [int(n) for n in input().split()]
  i = min(h, w)
  j = max(h, w)
  area = i * j
  if i % 3 == 0 or j % 3 == 0:
      print(0)
  else:
      p = j // 3 + 1
      pp = i // 3 + 1
      q = j // 3 - 1
      qq = i // 3 - 1
      a1 = i * p
      aa1 = j * p
      a2 = i * q
      aa2 = j * q
      b1 = i // 2 * (j - p)
      bb1 = j // 2 * (i - p)
      b2 = i // 2 * (j - q)
      bb2 = j // 2 * (i - q)
      c1 = (j - p) // 2 * i
      cc1 = (i - p) // 2 * j
      c2 = (j - q) // 2 * i
      cc2 = (i - q) // 2 * j
  
      print(min(
          abs(max(a1, b1, area - a1 - b1) - min(a1, b1, area - a1 - b1))
          abs(max(aa1, bb1, area - aa1 - bb1) - min(aa1, b1, area - aa1 - bb1))
          abs(max(aa2, bb2, area - aa2 - bb2) - min(aa2, bb2, area - aa2 - bb2))
          abs(max(a2, b2, area - a2 - b2) - min(a2, b2, area - a2 - b2))
          abs(max(a1, c1, area - a1 - c1) - min(a1, c1, area - a1 - c1))
          abs(max(aa1, cc1, area - aa1 - cc1) - min(aa1, c1, area - aa1 - cc1))
          abs(max(aa2, cc2, area - aa2 - cc2) - min(aa2, cc2, area - aa2 - cc2))
          abs(max(a2, c2, area - a2 - c2) - min(a2, c2, area - a2 - c2))
  
      ))
problem_description: Statement
  
  There is a bar of chocolate with a height of H blocks and a width of W blocks.
  Snuke is dividing this bar into exactly three pieces. He can only cut the bar
  along borders of blocks, and the shape of each piece must be a rectangle.
  
  Snuke is trying to divide the bar as evenly as possible. More specifically, he
  is trying to minimize S_{max} \- S_{min}, where S_{max} is the area (the
  number of blocks contained) of the largest piece, and S_{min} is the area of
  the smallest piece. Find the minimum possible value of S_{max} - S_{min}.
samples: [{"input": "3 5", "output": "0\n    \n\nIn the division below, S_{max} - S_{min} = 5 - 5 = 0.\n\n![2a9b2ef47b750c0b7ba3e865d4fb4203.png](https://atcoder.jp/img/arc074/2a9b2ef47b750c0b7ba3e865d4fb4203.png)\n\n* * *"}, {"input": "4 5", "output": "2\n    \n\nIn the division below, S_{max} - S_{min} = 8 - 6 = 2.\n\n![a42aae7aaaadc4640ac5cdf88684d913.png](https://atcoder.jp/img/arc074/a42aae7aaaadc4640ac5cdf88684d913.png)\n\n* * *"}, {"input": "5 5", "output": "4\n    \n\nIn the division below, S_{max} - S_{min} = 10 - 6 = 4.\n\n![eb0ad0cb3185b7ae418e21c472ff7f26.png](https://atcoder.jp/img/arc074/eb0ad0cb3185b7ae418e21c472ff7f26.png)\n\n* * *"}, {"input": "100000 2", "output": "1\n    \n\n* * *"}, {"input": "100000 100000", "output": "50000"}]