No problem, we've got 4391 and 8363 to multiply
4391 × 8363 = 8363 × (4391)
+ 8363 × 1 what gives us 8363
+ 8363 × 90 which equals 752670
+ 8363 × 300 that equals 2508900
+ 8363 × 4000 that equals 33452000

= 36721933
