No problem, we've got 1970 and 3880 to multiply
1970 × 3880 = 3880 × (1970)
+ 3880 × 0 what gives us 0
+ 3880 × 70 giving us 271600
+ 3880 × 900 giving us 3492000
+ 3880 × 1000 yielding 3880000

= 7643600
