No problem, we've got 1855 and 1920 to multiply
1855 × 1920 = 1920 × (1855)
+ 1920 × 5 that results in 9600
+ 1920 × 50 that results in 96000
+ 1920 × 800 that results in 1536000
+ 1920 × 1000 that equals 1920000

= 3561600
