No problem, we've got 2160 and 3360 to multiply
2160 × 3360 = 3360 × (2160)
+ 3360 × 0 what gives us 0
+ 3360 × 60 producing 201600
+ 3360 × 100 what gives us 336000
+ 3360 × 2000 giving us 6720000

= 7257600
