21 lines
293 B
Python
21 lines
293 B
Python
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from math import ceil
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def main():
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x, y = [int(i) for i in input().split()]
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if x==y:
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return x
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c = ceil(x / (2*y))
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if x < y:
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return -1
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if c > (x+y)/(2*x):
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print(c, (x+y)/(2*x))
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c = ceil((x+y)/(2*x))
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return (x+y)/(2*c)
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print(main())
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