come si fa 10000 x 20000 ?

0 0 0 0 1 0 0 0 0 2 x = 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 2
x