No problem, we've got 8340 and 2560 to multiply
8340 × 2560 = 2560 × (8340)
+ 2560 × 0 producing 0
+ 2560 × 40 resulting in 102400
+ 2560 × 300 that results in 768000
+ 2560 × 8000 that equals 20480000

= 21350400
