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NxM
...
  |-8   -3    2    1  -4   ...
a>| 0    8    4    0   0
...

My starting position is (a,a) = 0
My end position is  (b,b) = 10

pathA: left, up, left, left, up =  0+0+1+2+(-3)+10 = 10
pathB: left-slide + up-slide = 0+8+10 = 18   
pathC: up-slide + left + up + left-slide+down = 0+3+0+17+3+10= 33

etc..