func main()
	var a: []int :: #[3]int
	for i(0, 2)
		do a[i] :: cui@inputInt()
	end for
	do a.sort()
	
	var p: float :: a[2] $ float
	var q: float :: a[1] $ float
	var r: float :: a[0] $ float
	var s: float :: p + q + r
	do p :/ s
	do q :/ s
	do r :/ s
	
	var ans: float :: [p, (1.0 - r)].max()
	do cui@print("\{ans.toStrFmt(".12f")}\n")
end func