не 16, а 1 mod 16

Date: 2014-05-20 22:36 (UTC)
0001|0101
0101------ правый разряд очевидно 1
-----
110 |1101 следующий 0, потом 1
01
---
1
1 самый старший 1
-
0

по сложности эквивалентно одному обычному делению
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