No problem, we've got 1215 and 3981 to multiply
1215 × 3981 = 3981 × (1215)
+ 3981 × 5 which equals 19905
+ 3981 × 10 what gives us 39810
+ 3981 × 200 yielding 796200
+ 3981 × 1000 that equals 3981000

= 4836915
