Created
September 27, 2015 17:54
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| # XOR of first N natural no.s | |
| N = int(input()) | |
| if (N % 2) == 0: | |
| if (N % 4) == 0: | |
| r = N | |
| else: | |
| r = N+1 | |
| else: | |
| if (N % 4) == 1: | |
| r = 1 | |
| else: | |
| r = 0 | |
| print(r) |
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