No problem, we've got 8399 and 6157 to multiply
8399 × 6157 = 6157 × (8399)
+ 6157 × 9 what gives us 55413
+ 6157 × 90 yielding 554130
+ 6157 × 300 which equals 1847100
+ 6157 × 8000 that equals 49256000

= 51712643
