No problem, we've got 6429 and 257 to multiply
6429 × 257 = 257 × (6429)
+ 257 × 9 giving us 2313
+ 257 × 20 what gives us 5140
+ 257 × 400 what gives us 102800
+ 257 × 6000 what gives us 1542000

= 1652253
