No problem, we've got 3903 and 4647 to multiply
3903 × 4647 = 4647 × (3903)
+ 4647 × 3 what gives us 13941
+ 4647 × 00 giving us 0
+ 4647 × 900 resulting in 4182300
+ 4647 × 3000 producing 13941000

= 18137241
