No problem, we've got 1685 and 4158 to multiply
1685 × 4158 = 4158 × (1685)
+ 4158 × 5 yielding 20790
+ 4158 × 80 what gives us 332640
+ 4158 × 600 which equals 2494800
+ 4158 × 1000 yielding 4158000

= 7006230
