No problem, we've got 1428 and 8415 to multiply
1428 × 8415 = 8415 × (1428)
+ 8415 × 8 what gives us 67320
+ 8415 × 20 which equals 168300
+ 8415 × 400 that is equal 3366000
+ 8415 × 1000 that results in 8415000

= 12016620
