No problem, we've got 2815 and 7798 to multiply
2815 × 7798 = 7798 × (2815)
+ 7798 × 5 that results in 38990
+ 7798 × 10 what gives us 77980
+ 7798 × 800 that is equal 6238400
+ 7798 × 2000 yielding 15596000

= 21951370
