func main()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	var s: int :: cui@inputInt()
	var ans: int :: 0
	if(s = 1 | (a - s).abs() <= (b - s).abs())
		do ans :: (a - s).abs()
		do a :: s
		do ans :+ a
	else
		do ans :: (b - s).abs()
		do b :: s
		if(a = 0)
			do ans :+ b + 1
		else
			do ans :+ a
			do ans :+ [(a - b).abs(), b - 1].min()
		end if
	end if
	do cui@print("\{ans}\n")
end func