No problem, we've got 4031 and 5139 to multiply
4031 × 5139 = 5139 × (4031)
+ 5139 × 1 producing 5139
+ 5139 × 30 yielding 154170
+ 5139 × 000 that is equal 0
+ 5139 × 4000 yielding 20556000

= 20715309
