  4   7  24        
  
2022/4/8
      4  7  0  24           2      1    1             3            1    2         4  7  24                9     1    1    6   1         15     8    7          1                                     2  15                495     436    25     15    1    9    1    3    3    2        486     435    25     15    3    3    3    2  
     