No problem, we've got 3159 and 4000 to multiply
3159 × 4000 = 4000 × (3159)
+ 4000 × 9 producing 36000
+ 4000 × 50 that is equal 200000
+ 4000 × 100 resulting in 400000
+ 4000 × 3000 resulting in 12000000

= 12636000
