come si fa 623176 x 1255 ?

6 7 1 3 2 6 5 5 2 1 x = 0 3 8 3 8 5 1 1 1 1 3 0 3 8 3 8 5 1 1 1 1 3 2 1 5 1 3 6 4 2 1 6 7 1 3 2 6 1 2 1 1 0 8 8 5 8 0 2 8 7
x