No problem, we've got 3942 and 4005 to multiply
3942 × 4005 = 4005 × (3942)
+ 4005 × 2 yielding 8010
+ 4005 × 40 which equals 160200
+ 4005 × 900 that is equal 3604500
+ 4005 × 3000 producing 12015000

= 15787710
