No problem, we've got 5187 and 3879 to multiply
5187 × 3879 = 3879 × (5187)
+ 3879 × 7 yielding 27153
+ 3879 × 80 what gives us 310320
+ 3879 × 100 resulting in 387900
+ 3879 × 5000 that is equal 19395000

= 20120373
