No problem, we've got 7663 and 640 to multiply
7663 × 640 = 640 × (7663)
+ 640 × 3 resulting in 1920
+ 640 × 60 that equals 38400
+ 640 × 600 yielding 384000
+ 640 × 7000 that results in 4480000

= 4904320
