No problem, we've got 2603 and 8026 to multiply
2603 × 8026 = 8026 × (2603)
+ 8026 × 3 what gives us 24078
+ 8026 × 00 yielding 0
+ 8026 × 600 what gives us 4815600
+ 8026 × 2000 that equals 16052000

= 20891678
