No problem, we've got 4389 and 4159 to multiply
4389 × 4159 = 4159 × (4389)
+ 4159 × 9 resulting in 37431
+ 4159 × 80 which equals 332720
+ 4159 × 300 that is equal 1247700
+ 4159 × 4000 that results in 16636000

= 18253851
