No problem, we've got 3864 and 5161 to multiply
3864 × 5161 = 5161 × (3864)
+ 5161 × 4 that is equal 20644
+ 5161 × 60 resulting in 309660
+ 5161 × 800 what gives us 4128800
+ 5161 × 3000 which equals 15483000

= 19942104
