No problem, we've got 3671 and 5672 to multiply
3671 × 5672 = 5672 × (3671)
+ 5672 × 1 what gives us 5672
+ 5672 × 70 giving us 397040
+ 5672 × 600 that results in 3403200
+ 5672 × 3000 producing 17016000

= 20821912
