No problem, we've got 3894 and 1810 to multiply
3894 × 1810 = 1810 × (3894)
+ 1810 × 4 giving us 7240
+ 1810 × 90 what gives us 162900
+ 1810 × 800 that results in 1448000
+ 1810 × 3000 which equals 5430000

= 7048140
