No problem, we've got 1405 and 8521 to multiply
1405 × 8521 = 8521 × (1405)
+ 8521 × 5 yielding 42605
+ 8521 × 00 what gives us 0
+ 8521 × 400 which equals 3408400
+ 8521 × 1000 giving us 8521000

= 11972005
