No problem, we've got 3921 and 4384 to multiply
3921 × 4384 = 4384 × (3921)
+ 4384 × 1 which equals 4384
+ 4384 × 20 resulting in 87680
+ 4384 × 900 that is equal 3945600
+ 4384 × 3000 resulting in 13152000

= 17189664
