No problem, we've got 3624 and 3999 to multiply
3624 × 3999 = 3999 × (3624)
+ 3999 × 4 what gives us 15996
+ 3999 × 20 that is equal 79980
+ 3999 × 600 resulting in 2399400
+ 3999 × 3000 which equals 11997000

= 14492376
