No problem, we've got 8257 and 1604 to multiply
8257 × 1604 = 1604 × (8257)
+ 1604 × 7 what gives us 11228
+ 1604 × 50 resulting in 80200
+ 1604 × 200 which equals 320800
+ 1604 × 8000 what gives us 12832000

= 13244228
