Compute the XOR of all integers from 0 to n inclusive: 0 XOR 1 XOR 2 XOR ... XOR n.
One line: a non-negative integer n.
One line: the XOR of 0..n.
Example 1
Input
5
Expected
1
Explanation
0^1^2^3^4^5 = 1.
Example 2
Input
0
Expected
0
Explanation
The XOR of just 0 is 0.
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