No problem, we've got 1821 and 4999 to multiply
1821 × 4999 = 4999 × (1821)
+ 4999 × 1 what gives us 4999
+ 4999 × 20 yielding 99980
+ 4999 × 800 yielding 3999200
+ 4999 × 1000 what gives us 4999000

= 9103179
