No problem, we've got 1579 and 421 to multiply
1579 × 421 = 421 × (1579)
+ 421 × 9 what gives us 3789
+ 421 × 70 that results in 29470
+ 421 × 500 giving us 210500
+ 421 × 1000 that results in 421000

= 664759
