No problem, we've got 5603 and 3907 to multiply
5603 × 3907 = 3907 × (5603)
+ 3907 × 3 yielding 11721
+ 3907 × 00 resulting in 0
+ 3907 × 600 resulting in 2344200
+ 3907 × 5000 yielding 19535000

= 21890921
