1397 x 27 + 397 x 13​
(1000+397) x 27 + 397 x 13
(1000 x 27) +(397 x 27) + 397 x 13
27000 + 397(27 + 13)
27000 + 397 x 40
27000 + (400 - 3) x 40
27000 + 16000 - 120
427880
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