No problem, we've got 3891 and 8008 to multiply
3891 × 8008 = 8008 × (3891)
+ 8008 × 1 that is equal 8008
+ 8008 × 90 what gives us 720720
+ 8008 × 800 that is equal 6406400
+ 8008 × 3000 giving us 24024000

= 31159128
