No problem, we've got 4002 and 3857 to multiply
4002 × 3857 = 3857 × (4002)
+ 3857 × 2 giving us 7714
+ 3857 × 00 which equals 0
+ 3857 × 000 yielding 0
+ 3857 × 4000 which equals 15428000

= 15435714
