No problem, we've got 3781 and 5240 to multiply
3781 × 5240 = 5240 × (3781)
+ 5240 × 1 what gives us 5240
+ 5240 × 80 producing 419200
+ 5240 × 700 which equals 3668000
+ 5240 × 3000 yielding 15720000

= 19812440
