No problem, we've got 3894 and 8140 to multiply
3894 × 8140 = 8140 × (3894)
+ 8140 × 4 resulting in 32560
+ 8140 × 90 what gives us 732600
+ 8140 × 800 what gives us 6512000
+ 8140 × 3000 that results in 24420000

= 31697160
