No problem, we've got 1143 and 3901 to multiply
1143 × 3901 = 3901 × (1143)
+ 3901 × 3 that equals 11703
+ 3901 × 40 that equals 156040
+ 3901 × 100 what gives us 390100
+ 3901 × 1000 that equals 3901000

= 4458843
