C. Magic Formulas
People in the Tomskaya region like magic formulas very much. You can see some of them below.
Imagine you are given a sequence of positive integer numbers p1, p2,
..., pn. Lets
write down some magic formulas:
Here, "mod" means the operation of taking the residue after dividing.
The expression means
applying the bitwise xor (excluding "OR") operation to integers x and y.
The given operation exists in all m......
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