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