No problem, we've got 8421 and 3503 to multiply
8421 × 3503 = 3503 × (8421)
+ 3503 × 1 which equals 3503
+ 3503 × 20 that results in 70060
+ 3503 × 400 which equals 1401200
+ 3503 × 8000 resulting in 28024000

= 29498763
