10 lines
183 B
Python
10 lines
183 B
Python
S = lambda n: n*(n+1)//2
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N = int(input())
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nor = round((2*N)**.5)
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t = N - S(nor-1)
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k = S(nor) - S(nor-1)
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if nor % 2:
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print("%d/%d"%(k-t+1, t))
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else:
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print("%d/%d"%(t, k-t+1))
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