No problem, we've got 3855 and 1047 to multiply
3855 × 1047 = 1047 × (3855)
+ 1047 × 5 that is equal 5235
+ 1047 × 50 that equals 52350
+ 1047 × 800 resulting in 837600
+ 1047 × 3000 which equals 3141000

= 4036185
