No problem, we've got 1431 and 8405 to multiply
1431 × 8405 = 8405 × (1431)
+ 8405 × 1 what gives us 8405
+ 8405 × 30 yielding 252150
+ 8405 × 400 yielding 3362000
+ 8405 × 1000 which equals 8405000

= 12027555
