No problem, we've got 4515 and 3988 to multiply
4515 × 3988 = 3988 × (4515)
+ 3988 × 5 that is equal 19940
+ 3988 × 10 that equals 39880
+ 3988 × 500 resulting in 1994000
+ 3988 × 4000 that results in 15952000

= 18005820
