No problem, we've got 1380 and 3978 to multiply
1380 × 3978 = 3978 × (1380)
+ 3978 × 0 what gives us 0
+ 3978 × 80 yielding 318240
+ 3978 × 300 which equals 1193400
+ 3978 × 1000 which equals 3978000

= 5489640
