No problem, we've got 3340 and 6404 to multiply
3340 × 6404 = 6404 × (3340)
+ 6404 × 0 what gives us 0
+ 6404 × 40 that results in 256160
+ 6404 × 300 giving us 1921200
+ 6404 × 3000 resulting in 19212000

= 21389360
