No problem, we've got 3961 and 6240 to multiply
3961 × 6240 = 6240 × (3961)
+ 6240 × 1 that equals 6240
+ 6240 × 60 that equals 374400
+ 6240 × 900 giving us 5616000
+ 6240 × 3000 that results in 18720000

= 24716640
