No problem, we've got 3877 and 5321 to multiply
3877 × 5321 = 5321 × (3877)
+ 5321 × 7 yielding 37247
+ 5321 × 70 resulting in 372470
+ 5321 × 800 resulting in 4256800
+ 5321 × 3000 that is equal 15963000

= 20629517
