No problem, we've got 2387 and 5791 to multiply
2387 × 5791 = 5791 × (2387)
+ 5791 × 7 that equals 40537
+ 5791 × 80 which equals 463280
+ 5791 × 300 resulting in 1737300
+ 5791 × 2000 that is equal 11582000

= 13823117
