No problem, we've got 1669 and 4780 to multiply
1669 × 4780 = 4780 × (1669)
+ 4780 × 9 producing 43020
+ 4780 × 60 what gives us 286800
+ 4780 × 600 resulting in 2868000
+ 4780 × 1000 what gives us 4780000

= 7977820
