No problem, we've got 2643 and 8155 to multiply
2643 × 8155 = 8155 × (2643)
+ 8155 × 3 yielding 24465
+ 8155 × 40 resulting in 326200
+ 8155 × 600 that results in 4893000
+ 8155 × 2000 what gives us 16310000

= 21553665
