No problem, we've got 3999 and 6368 to multiply
3999 × 6368 = 6368 × (3999)
+ 6368 × 9 what gives us 57312
+ 6368 × 90 what gives us 573120
+ 6368 × 900 that is equal 5731200
+ 6368 × 3000 producing 19104000

= 25465632
