No problem, we've got 3971 and 1023 to multiply
3971 × 1023 = 1023 × (3971)
+ 1023 × 1 producing 1023
+ 1023 × 70 that equals 71610
+ 1023 × 900 which equals 920700
+ 1023 × 3000 giving us 3069000

= 4062333
