No problem, we've got 1599 and 7761 to multiply
1599 × 7761 = 7761 × (1599)
+ 7761 × 9 resulting in 69849
+ 7761 × 90 that results in 698490
+ 7761 × 500 giving us 3880500
+ 7761 × 1000 that is equal 7761000

= 12409839
